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Segment Information - Reconciliation of Total Segment Operating Income to Consolidated Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 408,628	$ 355,145	$ 341,293	$ 311,656	$ 384,055	$ 273,012	$ 250,356	$ 251,406	$ 1,416,722	$ 1,158,829	$ 1,050,464
Gross profit	$ 362,910	$ 305,447	$ 292,508	$ 267,804	$ 337,896	$ 230,726	$ 207,201	$ 204,603	1,228,669	980,426	863,132
Direct costs									1,061,329	842,086	774,909
Income from operations									167,340	138,340	88,223
Reportable segments
Segment Reporting Information [Line Items]
Revenues									1,416,722	1,158,828	1,050,456
Gross profit									1,228,764	980,473	863,124
Direct costs									981,969	788,461	727,176
Income from operations									246,795	192,012	135,948
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues									(1,189)	(229)	(300)
Gross profit									(824)	(229)	(300)
Direct costs									(824)	(229)	(300)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenues									0	1	8
Gross profit									(95)	(47)	8
Direct costs									79,360	53,625	47,733
Income from operations									(79,455)	(53,672)	(47,725)
Cybersecurity and Martech \| Reportable segments
Segment Reporting Information [Line Items]
Revenues									348,611	347,697	340,245
Gross profit									255,042	246,815	245,966
Direct costs									225,740	193,883	187,283
Income from operations									29,302	52,932	58,683
Digital Media \| Reportable segments
Segment Reporting Information [Line Items]
Revenues									1,069,300	811,360	710,511
Gross profit									974,546	733,887	617,458
Direct costs									757,053	594,807	540,193
Income from operations									$ 217,493	$ 139,080	$ 77,265