Segment Information - Reconciliation of U.S. GAAP Loss Before Income Taxes to Adjusted EBITDA (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Segment Reporting [Abstract]
Adjusted EBITDA		$ 43,055	$ 46,590
Stock-based compensation expense		(22,161)	(18,614)
Interest expense		(1,526)	(585)
Depreciation and amortization		(9,750)	(7,686)
Special adjustments, interest income and other	[1]	(2,345)	(1,647)
Income before income taxes		$ 7,273	$ 18,058

[1] The three months ended March 31, 2023, includes a $7.0 million loss from the mark-to-market adjustment of contingent consideration associated with the World Programming acquisition, $2.9 million of interest income, and $1.8 million currency gains on acquisition-related intercompany loans. The three months ended March 31, 2022, includes $1.5 million currency losses on acquisition-related intercompany loans.