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Changes In Real Estate and Accumulated Depreciation (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
ASSET BASIS      
Beginning Balance $ 645,339 $ 570,807 $ 574,602
Additions to land, buildings and improvements 294,310 79,901 2,770
Disposition of land, buildings and improvements (35,477) (5,369) (89)
Impairment loss (2,965)   (6,476)
Ending Balance 901,207 645,339 570,807
ACCUMULATED DEPRECIATION      
Beginning Balance 126,168 104,797 79,608
Depreciation for the period 31,732 26,740 25,235
Depreciation on assets sold or disposed (11,693) (5,369) (46)
Ending Balance $ 146,207 $ 126,168 $ 104,797