Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Lease on Property (Detail)

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Real Estate and Intangible Assets - Summary of Lease on Property (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
ft²
option
property
Jun. 30, 2015
USD ($)
ft²
option
property
Real Estate Properties [Line Items]    
Number of properties acquired | property   4
Square Footage (unaudited) | ft²   188,417,000
Renewal Options | option   2
Renewal Options Period   5 years
Annualized GAAP Rent   $ 2,918
Tenant Improvement   1,106
Leasing Commissions   $ 631
Bolingbrook, IL [Member]    
Real Estate Properties [Line Items]    
Lessor Leasing Arrangements, Operating Leases, Term of Contract 7 years 2 months 12 days  
Lease Commencement Date Jul. 01, 2016  
Square Footage (unaudited) | ft² 13,816  
Renewal Options | option 1  
Renewal Options Period 5 years  
Annualized GAAP Rent $ 70  
Tenant Improvement 69  
Leasing Commissions $ 28  
Maple Heights, OH [Member]    
Real Estate Properties [Line Items]    
Lessor Leasing Arrangements, Operating Leases, Term of Contract 5 years 2 months 12 days  
Lease Commencement Date Jun. 01, 2016  
Square Footage (unaudited) | ft² 40,606  
Renewal Options | option 2  
Renewal Options Period 3 years  
Annualized GAAP Rent $ 109  
Tenant Improvement 0  
Leasing Commissions $ 34  
Indianapolis, IN [Member]    
Real Estate Properties [Line Items]    
Lessor Leasing Arrangements, Operating Leases, Term of Contract   8 years 3 months 18 days
Lease Commencement Date   Jan. 01, 2015
Square Footage (unaudited) | ft²   3,546,000
Annualized GAAP Rent   $ 64
Tenant Improvement   64
Leasing Commissions   $ 28
Indianapolis, IN One [Member]    
Real Estate Properties [Line Items]    
Lessor Leasing Arrangements, Operating Leases, Term of Contract   3 years
Lease Commencement Date   Feb. 01, 2015
Square Footage (unaudited) | ft²   8,275,000
Annualized GAAP Rent   $ 124
Tenant Improvement   0
Leasing Commissions   $ 0
Raleigh, NC [Member]    
Real Estate Properties [Line Items]    
Lessor Leasing Arrangements, Operating Leases, Term of Contract   5 years 6 months
Lease Commencement Date   Feb. 01, 2015
Square Footage (unaudited) | ft²   58,926,000
Annualized GAAP Rent   $ 711
Tenant Improvement   0
Leasing Commissions   $ 144
Columbus, OH [Member]    
Real Estate Properties [Line Items]    
Lessor Leasing Arrangements, Operating Leases, Term of Contract   7 years 1 month 6 days
Lease Commencement Date   Dec. 01, 2016
Square Footage (unaudited) | ft²   9,484,000
Annualized GAAP Rent   $ 1,246
Tenant Improvement   142
Leasing Commissions   $ 29
Raleigh, NC One [Member]    
Real Estate Properties [Line Items]    
Lessor Leasing Arrangements, Operating Leases, Term of Contract   5 years 6 months
Lease Commencement Date   Feb. 01, 2015
Square Footage (unaudited) | ft²   21,300,000
Annualized GAAP Rent   $ 239
Tenant Improvement   100
Leasing Commissions   $ 32
Burnsville, MN [Member]    
Real Estate Properties [Line Items]    
Lessor Leasing Arrangements, Operating Leases, Term of Contract 5 years 4 months 24 days  
Lease Commencement Date Dec. 01, 2016  
Square Footage (unaudited) | ft² 12,663  
Renewal Options | option 1  
Renewal Options Period 5 years  
Annualized GAAP Rent $ 143  
Tenant Improvement 0  
Leasing Commissions $ 104  
Raleigh NC Two [Member]    
Real Estate Properties [Line Items]    
Lessor Leasing Arrangements, Operating Leases, Term of Contract   12 years 4 months 24 days
Lease Commencement Date   Aug. 01, 2015
Square Footage (unaudited) | ft²   86,886,000
Renewal Options | option   2
Renewal Options Period   5 years
Annualized GAAP Rent   $ 534
Tenant Improvement   800
Leasing Commissions   $ 398
Salt Lake City UT [Member]    
Real Estate Properties [Line Items]    
Number of properties acquired | property 1  
Renewal Options | option   1
Renewal Options Period   5 years