Changes in Accumulated Other Comprehensive Loss by Component - Reconciliation of Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) by component, beginning balance			$ (76,086)	$ (63,832)
Net current-period Other Comprehensive Income Gain (Loss)	$ 10,114	$ (4,951)	14,484	(762)
Accumulated other comprehensive income (loss) by component, ending balance	(61,602)	(64,594)	(61,602)	(64,594)
Gains and Losses on Cash Flow Hedges [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) by component, beginning balance			(646)	(140)
Net current-period Other Comprehensive Income Gain (Loss)			657	0
Accumulated other comprehensive income (loss) by component, ending balance	11	(140)	11	(140)
Defined Benefit Pension Plans [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) by component, beginning balance			(5,668)	(5,807)
Net current-period Other Comprehensive Income Gain (Loss)			(171)	148
Accumulated other comprehensive income (loss) by component, ending balance	(5,839)	(5,659)	(5,839)	(5,659)
Cumulative Foreign Currency Translation Adjustment [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) by component, beginning balance			(69,772)	(57,885)
Net current-period Other Comprehensive Income Gain (Loss)			13,998	(910)
Accumulated other comprehensive income (loss) by component, ending balance	$ (55,774)	$ (58,795)	$ (55,774)	$ (58,795)