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Schedule III - Reconciliation of Real Estate and Accumulated Depreciation (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]      
Beginning balance $ 545,370 $ 592,322 $ 585,090
Amounts capitalized 111,428 143,711 66,338
Amounts retired or adjusted (109,268) (190,663) (59,106)
Ending balance 547,530 545,370 592,322
Beginning balance (28,220) (26,955) (23,438)
Depreciation expense (2,185) (3,640) (3,547)
Amounts retired or adjusted 2,339 2,375 30
Ending balance $ (28,066) $ (28,220) $ (26,955)