Description of Business and Summary of Significant Accounting Policies - Schedule of Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services	$ 112,607	$ 110,605	$ 210,767	$ 228,581
Sales and marketing	87,394	79,105	163,934	168,397
General and administrative	33,100	44,194	74,379	93,756
Impairment charges	3,611	18,132	3,611	18,230
Depreciation and amortization	$ 29,908	37,606	$ 49,626	75,429
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services		91,974		191,594
Sales and marketing		65,811		141,164
General and administrative		38,513		82,547
Impairment charges		18,132		18,230
Depreciation and amortization		37,606		75,429
Revision of Prior Period, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services		18,631		36,987
Sales and marketing		13,294		27,233
General and administrative		5,681		11,209
Impairment charges		0		0
Depreciation and amortization		$ (37,606)		$ (75,429)