Segment and Geographical Information - Long Lived Assets and Continuing Operations by Country (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 2,815,691	$ 2,720,133	$ 2,709,732
Long-lived assets	38,267	52,657	67,022
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	2,463,958	2,355,139	2,311,051
Long-lived assets	35,434	49,637	62,921
Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	351,733	364,994	398,681
Long-lived assets	2,636	2,803	3,871
Other [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 197	$ 217	$ 230