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Schedule III - Reconciliation of Real Estate and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]      
Beginning balance $ 618,844 $ 607,133 $ 547,530
Amounts capitalized 89,780 124,633 214,184
Amounts retired or adjusted (415,621) (112,922) (154,581)
Ending balance 293,003 618,844 607,133
Beginning balance (32,129) (31,377) (28,066)
Depreciation expense (816) (6,810) (3,319)
Amounts retired or adjusted 32,945 6,058 8
Ending balance $ 0 $ (32,129) $ (31,377)