Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information - Summary of Quarterly Results of Operations (Parenthetical) (Detail)

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Quarterly Financial Information - Summary of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]            
Gain on sale of real estate $ 1,500       $ 1,538 $ 1,240
Impairment charge   $ 600   $ 14,000 $ 622 14,238
Gain on debt extinguishment     $ 5,300     $ 5,274