Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		$ 245,225
Other Comprehensive loss		2,758	$ (9,919)
Amounts reclassified from accumulated other comprehensive income	[1]	146	137
Ending balance		257,899
Loss reclassified from AOCI for defined benefit pension plans		100
Tax benefit reclassified from AOCI for defined benefit pension plans		100
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(16,920)	(6,586)
Other Comprehensive loss		2,758	(9,919)
Amounts reclassified from accumulated other comprehensive income	[1]	0	0
Ending balance		(14,162)	(16,505)
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]	146	137
Ending balance		(17,519)	(17,438)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(34,585)	(24,161)
Ending balance		$ (31,681)	$ (33,943)

[1] Amount represents amortization of actuarial losses, a component of net periodic benefit cost. This amount was $0.1 million, net of $0.1 million tax benefit for the quarters ended March 31, 2016 and 2015, respectively.