Income Taxes - Reconciliation of Income Taxes Computed at Statutory Rate (Detail) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Federal provision at statutory rate													$ 4,527	$ 10,411	$ 4,480
U.S./Foreign tax rate differential													393	731	(919)
Foreign non-deductible expenses													2,059	(1,759)	(2,006)
Foreign tax provision													793	1,253	615
State taxes, net of federal benefit													308	619	49
Change in uncertain tax positions													15	84	119
Change in valuation allowance													(2,054)	597	2,475
Tax credits													(2,652)	(2,049)	(152)
Share-based compensation													(14)	(50)	(657)
Repatriation of foreign earnings													1,235	(3,670)	3,964
GILTI, net of related foreign tax credit													730	1,194	0
Other													479	758	86
Provision for income taxes	$ (135)	$ 496	$ 2,230	$ 3,187	$ 368	$ (175)	$ 4,344	$ 3,550	$ 5,417	$ 7,894	$ 5,913	$ 7,719	5,778	8,087	15,067
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Change in tax rate													(41)	(32)	(264)
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Change in tax rate													$ 0	$ 0	$ 7,277