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Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss):      
Recognize the decrease in net gain $ 111 $ 4 $ 388
Amortization of net gain (loss) (1)    
Total recognized in other comprehensive loss $ 110 $ 4 $ 388