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Quarterly Financial Data (unaudited) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Quarterly Financial Information Disclosure [Abstract]      
Gain (loss) on business interruption insurance recovery     $ 460
Increase (decrease) In valuation allowance due to expected realization of deferred tax assets $ 1,908 $ 477