Annual report pursuant to Section 13 and 15(d)

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

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Schedule III - Real Estate and Accumulated Depreciation - Change in Balance of Real Estate (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 $ 533,753 $ 442,521 $ 401,017
Additions:      
Acquisitions during period 103,424 85,462 43,735
Improvements 5,176 5,770 1,164
Deductions:      
Dispositions during period         
Purchase price adjustments     (3,395)
Balance at end of period $ 642,353 $ 533,753 $ 442,521