Segment and Geographic Information - Summary of Revenue and Long-lived Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Revenues	$ 208,821	$ 206,715	$ 636,859	$ 614,693
Long-lived assets	111,622		111,622		$ 107,298
United States [Member]
Segment Reporting Information [Line Items]
Revenues	138,627	145,022	429,914	427,688
Long-lived assets	99,193		99,193		92,983
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenues	44,656	41,897	131,955	121,008
Long-lived assets	10,709		10,709		12,683
Other [Member]
Segment Reporting Information [Line Items]
Revenues	25,538	$ 19,796	74,990	$ 65,997
Long-lived assets	$ 1,720		$ 1,720		$ 1,632