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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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (51,986)	$ (44,005)	$ (54,151)	$ (35,134)
Other comprehensive income (loss) before reclassifications:
Gain (loss) on foreign currency translation adjustment	1,286	(10,001)	3,298	(19,046)
Amounts reclassified from AOCI:
Amortization of defined benefit pension actuarial loss	91	99	244	273
Net current period other comprehensive income (loss)	1,377	(9,902)	3,542	(18,773)
Ending Balance	(50,609)	(53,907)	(50,609)	(53,907)
Defined Benefit Pension Plan Activity [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(6,082)	(6,833)	(6,235)	(7,007)
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 loss	91	99	244	273
Net current period other comprehensive income (loss)	91	99	244	273
Ending Balance	(5,991)	(6,734)	(5,991)	(6,734)
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(45,904)	(37,172)	(47,916)	(28,127)
Other comprehensive income (loss) before reclassifications:
Gain (loss) on foreign currency translation adjustment	1,286	(10,001)	3,298	(19,046)
Amounts reclassified from AOCI:
Amortization of defined benefit pension actuarial loss	0	0	0	0
Net current period other comprehensive income (loss)	1,286	(10,001)	3,298	(19,046)
Ending Balance	$ (44,618)	$ (47,173)	$ (44,618)	$ (47,173)

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Other Comprehensive Income (Loss) Before Reclassifications [Abstract]

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax and 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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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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