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Summary of Significant Accounting Policies - Summary of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Cumulative currency translation adjustments $ (77,299) $ (68,063)
Unrealized gain on cash flow hedges, net of taxes of $1,207 and $662 2,740 824
Retirement benefits, net of taxes of ($342) and ($201) (498) (86)
Accumulated other comprehensive loss (75,057) (67,325)
Taxes on unrealized gain on cash flow hedges 1,207 662
Taxes on retirement benefits $ (342) $ (201)