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Impact from Foreign Exchange Derivative Instruments Designated in Cash Flow Hedges (Detail) - Cash Flow Hedge - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Gain recorded in accumulated other comprehensive loss $ 1,294 $ 3,192
Gain reclassified from accumulated other comprehensive loss into earnings $ (356) $ (1,910)