Stockholders' Equity - Summary of Reconciliation of Changes in Stockholders' Equity (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Beginning Balance	$ 288,221	$ 280,507	$ 283,378	$ 265,171	$ 258,719	$ 258,081	$ 283,378	$ 258,081
Adoption of ASU 2014-9						(75)
Common stock issued upon exercise of options		147	22	483	222	974
Purchase and retirement of common shares	(7)	(109)	(3,595)	(9)	(212)	(2,959)
Compensation cost for restricted stock	858	874	653	589	1,419	3,626
Compensation cost for stock option grants	259	311	324	359	475	900
Compensation cost for performance stock units	319	(569)	254	316	1,885	2,957
Net income (loss)	13,078	4,398	(3,258)	8,096	4,121	(2,119)	14,218	10,098
Currency translation adjustments	(1,557)	2,476	2,232	1,783	(1,652)	(2,154)	3,151	(2,023)
Unrealized gain (loss) on marketable securities	194	186	497	(34)	194	(512)	877	(352)
Ending Balance	$ 301,365	$ 288,221	$ 280,507	$ 276,754	$ 265,171	$ 258,719	$ 301,365	$ 276,754
Common Stock [Member]
Beginning Balance, Shares	61,725	61,667	61,276	61,174	61,053	60,662	61,276	60,662
Common stock issued upon exercise of options, Shares		18	4	62	29	133
Vesting of restricted stock and performance stock units, Shares	2	51	664	2	106	407
Purchase and retirement of common shares, Shares	(1)	(11)	(277)	(1)	(14)	(149)
Ending Balance, Shares	61,726	61,725	61,667	61,237	61,174	61,053	61,726	61,237
Additional Paid-in Capital [Member]
Beginning Balance	$ 399,585	$ 398,931	$ 401,273	$ 397,218	$ 393,429	$ 387,931	$ 401,273	$ 387,931
Common stock issued upon exercise of options		147	22	483	222	974
Purchase and retirement of common shares	(7)	(109)	(3,595)	(9)	(212)	(2,959)
Compensation cost for restricted stock	858	874	653	589	1,419	3,626
Compensation cost for stock option grants	259	311	324	359	475	900
Compensation cost for performance stock units	319	(569)	254	316	1,885	2,957
Ending Balance	401,014	399,585	398,931	398,956	397,218	393,429	401,014	398,956
Accumulated Other Comprehensive Loss [Member]
Beginning Balance	(13,315)	(15,977)	(18,706)	(14,464)	(13,006)	(10,340)	(18,706)	(10,340)
Currency translation adjustments	(1,557)	2,476	2,232	1,783	(1,652)	(2,154)
Unrealized gain (loss) on marketable securities	194	186	497	(34)	194	(512)
Ending Balance	(14,678)	(13,315)	(15,977)	(12,715)	(14,464)	(13,006)	(14,678)	(12,715)
Accumulated Deficit [Member]
Beginning Balance	(98,049)	(102,447)	(99,189)	(117,583)	(121,704)	(119,510)	(99,189)	(119,510)
Adoption of ASU 2014-9						(75)
Net income (loss)	13,078	4,398	(3,258)	8,096	4,121	(2,119)
Ending Balance	$ (84,971)	$ (98,049)	$ (102,447)	$ (109,487)	$ (117,583)	$ (121,704)	$ (84,971)	$ (109,487)

Stock issued during period, shares, vesting of restricted stock and performance stock units.

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