XML 50 R106.htm IDEA: XBRL DOCUMENT v2.4.0.8
Schedule III - Reconciliation of Real Estate and Accumulated Depreciation (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Real Estate and Accumulated Depreciation [Line Items]      
Beginning balance $ 592,322 $ 585,090 $ 567,229
Amounts capitalized 143,711 66,338 65,024
Amounts retired or adjusted (190,663) (59,106) (47,163)
Ending balance 545,370 592,322 585,090
Beginning balance (26,955) (23,438) (24,417)
Depreciation expense (3,640) (3,547) (2,582)
Amounts retired or adjusted 2,375 30 3,561
Ending balance $ (28,220) $ (26,955) $ (23,438)