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Income Tax - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation allowance		$ 326
Period of cumulative pre-tax income	3 years
Research and development tax credits	$ 774	280
Cash paid for income taxes	19,163	16,740	$ 12,931
Gross unrecognized tax benefits	3,101	1,007
Other Liabilities, Non current
Gross unrecognized tax benefits	3,100	1,000
UNITED KINGDOM
Valuation allowance	300	$ 300
Research and development tax credits	1,300
International
Unremitted earnings of subsidiaries, foreign	4,800
Cash paid for income taxes	$ 0

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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