Business Segments - Revenue and Long-Lived Assets by Geographic Location (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Service revenues	$ 7,238,142	$ 6,461,444	$ 5,109,000
Property and equipment, net	109,687	93,403
Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Service revenues	5,712,330	5,006,525	3,984,742
Property and equipment, net	90,388	76,757
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Service revenues	1,525,812	1,454,919	$ 1,124,258
Property and equipment, net	$ 19,299	$ 16,646