Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation - Change in Balance of Accumulated Depreciation (Detail)

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Schedule III - Real Estate and Accumulated Depreciation - Change in Balance of Accumulated Depreciation (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate And Accumulated Depreciation Disclosure [Abstract]      
Balance at beginning of period $ 65,730 $ 53,784 $ 43,659
Additions during period 15,511 11,946 10,125
Dispositions during period         
Balance at end of period $ 81,241 $ 65,730 $ 53,784