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Operating Segment and Enterprise Wide Reporting - Schedule of Revenues by Geographic Destination, Based on Location Products and Services and as a Percentage of Total Revenues (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 494,315	$ 448,984	$ 461,697
Revenues by geographical area percentage	100.00%	100.00%	100.00%
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 381,662	$ 356,288	$ 362,867
Revenues by geographical area percentage	77.00%	79.00%	79.00%
Europe (Excluding United Kingdom) [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 41,264	$ 34,897	$ 32,585
Revenues by geographical area percentage	9.00%	8.00%	7.00%
United Kingdom [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 21,913	$ 15,741	$ 21,316
Revenues by geographical area percentage	5.00%	4.00%	4.00%
Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 17,213	$ 14,005	$ 17,246
Revenues by geographical area percentage	3.00%	3.00%	4.00%
Asia Pacific [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 26,768	$ 22,969	$ 22,842
Revenues by geographical area percentage	5.00%	5.00%	5.00%
Other [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 5,495	$ 5,084	$ 4,841
Revenues by geographical area percentage	1.00%	1.00%	1.00%

X

- Definition

Revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts generated in the geographical area as a percentage of total global revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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