Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2017	Jun. 30, 2017		Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			$ 273,456
Other Comprehensive loss			14,469		$ (1,268)
Amounts reclassified from accumulated other comprehensive loss			344		285
Ending balance		$ 313,166	313,166
Loss reclassified from AOCI for defined benefit pension plans		300			300
Tax benefit reclassified from AOCI for defined benefit pension plans		200			200
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(27,885)		(16,920)
Other Comprehensive loss			14,513		(1,268)
Amounts reclassified from accumulated other comprehensive loss			0		0
Ending balance		(13,372)	(13,372)		(18,188)
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]		344		285
Ending balance		(19,721)	(19,721)		(17,380)
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			0		0
Other Comprehensive loss			(44)	[2]	0
Amounts reclassified from accumulated other comprehensive loss			0		0
Ending balance		(44)	(44)		0
Total Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(47,950)		(34,585)
Ending balance		$ (33,137)	$ (33,137)		$ (35,568)

[1] Amount represents amortization of actuarial losses, a component of net periodic benefit cost. This amount was $0.3 million, net of $0.2 million tax benefit for the six months ended June 30, 2017 and 2016.

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