Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				$ 245,225
Other Comprehensive loss				(1,268)	$ (5,987)
Amounts reclassified from accumulated other comprehensive income	[1]			285	274
Ending balance		$ 265,939		265,939
Loss reclassified from AOCI for defined benefit pension plans		100	$ 100	300	300
Tax benefit reclassified from AOCI for defined benefit pension plans		100	100	200	200
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				(16,920)	(6,586)
Other Comprehensive loss				(1,268)	(5,987)
Amounts reclassified from accumulated other comprehensive income	[1]			0	0
Ending balance		(18,188)	(12,573)	(18,188)	(12,573)
Defined Benefit Pension Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				(17,665)	(17,575)
Other Comprehensive loss				0	0
Amounts reclassified from accumulated other comprehensive income	[1]			285	274
Ending balance		(17,380)	(17,301)	(17,380)	(17,301)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				(34,585)	(24,161)
Ending balance		$ (35,568)	$ (29,874)	$ (35,568)	$ (29,874)

[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, and $0.3 million, net of $0.2 million tax benefit, for the six months ended June 30, 2016 and 2015, respectively.