Segment Information - Schedule of Fixed Assets, Goodwill and Intangibles, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Fixed assets, net book value	$ 81,054				$ 88,189				$ 81,054	$ 88,189
Intangible Assets, Net (Including Goodwill)	795,567				808,720				795,567	808,720
Services	381,975	$ 342,907	$ 362,130	$ 328,791	393,662	$ 375,830	$ 379,743	$ 326,968	1,415,803	1,476,203	$ 1,513,779
UNITED STATES
Segment Reporting Information [Line Items]
Fixed assets, net book value	68,497				76,781				68,497	76,781
Intangible Assets, Net (Including Goodwill)	668,567				679,344				668,567	679,344
Services									1,116,045	1,153,191	1,172,364
CANADA
Segment Reporting Information [Line Items]
Fixed assets, net book value	4,475				4,779				4,475	4,779
Intangible Assets, Net (Including Goodwill)	64,842				61,748				64,842	61,748
Services									105,067	124,001	123,093
Other
Segment Reporting Information [Line Items]
Fixed assets, net book value	8,082				6,629				8,082	6,629
Intangible Assets, Net (Including Goodwill)	$ 62,158				$ 67,628				62,158	67,628
Services									$ 194,691	$ 199,011	$ 218,322