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Accumulated Other Comprehensive Income (Loss) - Components of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 347,794	$ 335,397	$ 319,846	$ 296,608	$ 335,397	$ 296,608
Other comprehensive loss					(4,788)
Income taxes					641
Interest income (expense), net	186		(181)		386	(615)
Other expense, net	(8,146)		(5,054)		(8,786)	(5,785)
Income taxes	13,656		(117)		8,869	6,352
Ending Balance	306,434	343,682	323,350	313,174	306,434	323,350
Reclassification Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Interest income (expense), net					(1,034)
Other expense, net					(5,193)
Income taxes					1,559
ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Cumulative effect adjustment from adoption of ASU 2018-02					938
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(2,386)			(2,386)
Other comprehensive loss					(2,195)
Ending Balance	(4,581)				(4,581)
Debt Security [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		5,682			5,682
Other comprehensive loss					(2,593)
Income taxes					641
Debt Security [Member] | Reclassification Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Interest income (expense), net					(1,034)
Other expense, net					(5,193)
Income taxes					1,559
Debt Security [Member] | ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Cumulative effect adjustment from adoption of ASU 2018-02					938
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	1,462	3,296	4,837	3,787	3,296	3,787
Ending Balance	$ (4,581)	1,833	$ 4,867	$ 4,484	$ (4,581)	$ 4,867
Accumulated Other Comprehensive Income (Loss) [Member] | ASU 2018-02 [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Cumulative effect adjustment from adoption of ASU 2018-02		$ 938

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Other comprehensive income loss tax portion attributable to unrealized gain (loss) on debt securities.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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