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Impact from Foreign Exchange Derivative Instruments Designated in Cash Flow Hedges (Detail) - Cash Flow Hedge - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Gain recorded in accumulated other comprehensive loss $ 3,716 $ 384
Gain reclassified from accumulated other comprehensive loss into earnings $ (2,730)