Annual report pursuant to Section 13 and 15(d)

Commitment and Contingencies - Future Tenant Improvement Payments Due on Properties (Detail)

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Commitment and Contingencies - Future Tenant Improvement Payments Due on Properties (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Operating Leased Assets [Line Items]  
2014 $ 62,160
2015 59,885
2016 56,004
2017 54,332
2018 52,527
Tenant Improvements [Member]
 
Operating Leased Assets [Line Items]  
2014 5,675
2015   
2016   
2017   
2018   
2019   
Thereafter   
Extended lease period 20 years
Lease expiration year 2034-09
Projected completion period of property expansion 2034-09
Tenant Improvements [Member] | Canton, Ohio Office Building [Member]
 
Operating Leased Assets [Line Items]  
Lease End Date 2024-07
2014 5,285
2015   
2016   
2017   
2018   
2019   
Thereafter   
Tenant Improvements [Member] | Concord Township, Ohio Office Building[Member]
 
Operating Leased Assets [Line Items]  
Lease End Date 2034-08
2014 150
2015   
2016   
2017   
2018   
2019   
Thereafter   
Tenant Improvements [Member] | Austin, TX [Member]
 
Operating Leased Assets [Line Items]  
Lease End Date 2015-06
2014 125
2015   
2016   
2017   
2018   
2019   
Thereafter   
Tenant Improvements [Member] | Roseville, Minnesota Office Building [Member]
 
Operating Leased Assets [Line Items]  
Lease End Date 2017-12
2014 80
2015   
2016   
2017   
2018   
2019   
Thereafter   
Tenant Improvements [Member] | Hialeah, Florida Industrial Building [Member]
 
Operating Leased Assets [Line Items]  
Lease End Date 2027-03
2014 35
2015   
2016   
2017   
2018   
2019   
Thereafter