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Accumulated Other Comprehensive Income ("AOCI") - Summary of Total Changes in AOCI by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 250,203	$ 247,021	$ 249,370	$ 238,537
Other comprehensive income (loss) before reclassifications:
Gain (loss) on foreign currency translation adjustment	1,100	(13,367)	2,453	(9,535)
Amounts reclassified from AOCI:
Amortization of defined benefit pension actuarial gain	93	92	186	183
Other comprehensive income (loss), net of tax	1,193	(13,275)	2,639	(9,352)
Ending Balance	257,852	239,529	257,852	239,529
Defined Benefit Pension Plan Activity [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(5,780)	(5,924)	(5,873)	(6,015)
Other comprehensive income (loss) before reclassifications:
Gain (loss) on foreign currency translation adjustment	0	0	0	0
Amounts reclassified from AOCI:
Amortization of defined benefit pension actuarial gain	93	92	186	183
Other comprehensive income (loss), net of tax	93	92	186	183
Ending Balance	(5,687)	(5,832)	(5,687)	(5,832)
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(52,357)	(37,593)	(53,710)	(41,425)
Other comprehensive income (loss) before reclassifications:
Gain (loss) on foreign currency translation adjustment	1,100	(13,367)	2,453	(9,535)
Amounts reclassified from AOCI:
Amortization of defined benefit pension actuarial gain	0	0	0	0
Other comprehensive income (loss), net of tax	1,100	(13,367)	2,453	(9,535)
Ending Balance	(51,257)	(50,960)	(51,257)	(50,960)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(58,137)	(43,517)	(59,583)	(47,440)
Amounts reclassified from AOCI:
Ending Balance	$ (56,944)	$ (56,792)	$ (56,944)	$ (56,792)

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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