Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Fair Value of Acquired Assets and Assumed Liabilities (Detail)

v2.4.0.8
Real Estate and Intangible Assets - Fair Value of Acquired Assets and Assumed Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Business Acquisition [Line Items]    
Total Purchase Price $ 74,911 $ 33,488
Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 4,767 1,702
Above Market Leases [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 261  
Below Market Leases [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 6  
Discount on Assumed Debt [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 249  
Allen, TX [Member]
   
Business Acquisition [Line Items]    
Total Purchase Price 5,525  
Allen, TX [Member] | Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 218  
Allen, TX [Member] | Discount on Assumed Debt [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 72  
Colleyville, TX [Member]
   
Business Acquisition [Line Items]    
Total Purchase Price 4,523  
Colleyville, TX [Member] | Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 181  
Colleyville, TX [Member] | Below Market Leases [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 6  
Colleyville, TX [Member] | Discount on Assumed Debt [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 59  
Rancho Cordova, CA [Member]
   
Business Acquisition [Line Items]    
Total Purchase Price 8,225  
Rancho Cordova, CA [Member] | Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 278  
Coppell, TX [Member]
   
Business Acquisition [Line Items]    
Total Purchase Price 5,838  
Coppell, TX [Member] | Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 230  
Coppell, TX [Member] | Discount on Assumed Debt [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 118  
Columbus, OH [Member]
   
Business Acquisition [Line Items]    
Total Purchase Price 11,800  
Columbus, OH [Member] | Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 990  
Columbus, OH [Member] | Above Market Leases [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 261  
Taylor, PA [Member]
   
Business Acquisition [Line Items]    
Total Purchase Price 39,000  
Taylor, PA [Member] | Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 2,870  
Egg Harbor Township, NJ [Member]
   
Business Acquisition [Line Items]    
Total Purchase Price   5,650
Egg Harbor Township, NJ [Member] | Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   259
Vance, AL [Member]
   
Business Acquisition [Line Items]    
Total Purchase Price   13,388
Vance, AL [Member] | Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   627
Blaine, MN [Member]
   
Business Acquisition [Line Items]    
Total Purchase Price   14,450
Blaine, MN [Member] | Customer Relationships [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   816
Land [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 8,443 3,144
Land [Member] | Allen, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 874  
Land [Member] | Colleyville, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 1,277  
Land [Member] | Rancho Cordova, CA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 752  
Land [Member] | Coppell, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 1,448  
Land [Member] | Columbus, OH [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 990  
Land [Member] | Taylor, PA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 3,102  
Land [Member] | Egg Harbor Township, NJ [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   1,627
Land [Member] | Vance, AL [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   457
Land [Member] | Blaine, MN [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   1,060
Building [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 45,464 21,803
Building [Member] | Allen, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 3,509  
Building [Member] | Colleyville, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 2,307  
Building [Member] | Rancho Cordova, CA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 5,898  
Building [Member] | Coppell, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 3,221  
Building [Member] | Columbus, OH [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 6,080  
Building [Member] | Taylor, PA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 24,449  
Building [Member] | Egg Harbor Township, NJ [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   2,735
Building [Member] | Vance, AL [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   9,721
Building [Member] | Blaine, MN [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   9,347
Tenant Improvements [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 3,541 2,262
Tenant Improvements [Member] | Allen, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 125  
Tenant Improvements [Member] | Colleyville, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 117  
Tenant Improvements [Member] | Rancho Cordova, CA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 278  
Tenant Improvements [Member] | Coppell, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 128  
Tenant Improvements [Member] | Columbus, OH [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 1,937  
Tenant Improvements [Member] | Taylor, PA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 956  
Tenant Improvements [Member] | Egg Harbor Township, NJ [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   282
Tenant Improvements [Member] | Vance, AL [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   808
Tenant Improvements [Member] | Blaine, MN [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   1,172
In-Place Leases [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 9,187 3,016
In-Place Leases [Member] | Allen, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 598  
In-Place Leases [Member] | Colleyville, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 486  
In-Place Leases [Member] | Rancho Cordova, CA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 473  
In-Place Leases [Member] | Coppell, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 636  
In-Place Leases [Member] | Columbus, OH [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 823  
In-Place Leases [Member] | Taylor, PA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 6,171  
In-Place Leases [Member] | Egg Harbor Township, NJ [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   558
In-Place Leases [Member] | Vance, AL [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   1,097
In-Place Leases [Member] | Blaine, MN [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   1,361
Leasing Costs [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 3,503 1,561
Leasing Costs [Member] | Allen, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 273  
Leasing Costs [Member] | Colleyville, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 220  
Leasing Costs [Member] | Rancho Cordova, CA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 546  
Leasing Costs [Member] | Coppell, TX [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 293  
Leasing Costs [Member] | Columbus, OH [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 719  
Leasing Costs [Member] | Taylor, PA [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired 1,452  
Leasing Costs [Member] | Egg Harbor Township, NJ [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   189
Leasing Costs [Member] | Vance, AL [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   678
Leasing Costs [Member] | Blaine, MN [Member]
   
Business Acquisition [Line Items]    
Fair value of acquired assets related to the properties acquired   $ 694