Description of Business and Summary of Significant Accounting Policies - Schedule of Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services	$ 104,167	$ 105,444	$ 314,934	$ 334,025
Sales and marketing	94,343	73,306	258,277	241,703
General and administrative	32,983	39,002	107,362	132,758
Impairment charges	0	1,184	3,611	19,414
Depreciation and amortization	$ 31,049	35,454	$ 80,675	110,883
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services		87,347		278,941
Sales and marketing		60,775		201,939
General and administrative		34,176		116,723
Impairment charges		1,184		19,414
Depreciation and amortization		35,454		110,883
Revision of Prior Period, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services		18,097		55,084
Sales and marketing		12,531		39,764
General and administrative		4,826		16,035
Impairment charges		0		0
Depreciation and amortization		$ (35,454)		$ (110,883)