Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		$ 273,456
Other Comprehensive loss		23,944		$ (2,324)
Amounts reclassified from accumulated other comprehensive loss		516		427
Ending balance		334,336
Loss reclassified from AOCI for defined benefit pension plans		500		500
Tax benefit reclassified from AOCI for defined benefit pension plans		300		300
Total Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(47,950)		(34,585)
Ending balance		(23,490)		(36,482)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(27,885)		(16,920)
Other Comprehensive loss		23,951		(2,324)
Amounts reclassified from accumulated other comprehensive loss		0		0
Ending balance		(3,934)		(19,244)
Defined Benefit Pension Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(20,065)		(17,665)
Other Comprehensive loss		0		0
Amounts reclassified from accumulated other comprehensive loss	[1]	516		427
Ending balance		(19,549)		(17,238)
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		0		0
Other Comprehensive loss		(7)	[2]	0
Amounts reclassified from accumulated other comprehensive loss		0		0
Ending balance		$ (7)		$ 0

[1] Amount represents amortization of actuarial losses, a component of net periodic benefit cost. This amount was $0.5 million, net of $0.3 million tax benefit for the nine months ended September 30, 2017 and 2016.

[2] Amount represents unrealized losses on the fair value of hedging activities, net of taxes, for the nine months ended September 30, 2017.