Goodwill and Intangible Assets, Net - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Balance as of beginning of period	$ 768,124	$ 628,186
Goodwill acquired	3,416	140,169
Measurement period adjustments	351	(117)
Impairment	(199,800)	0	$ 0
Foreign currency translation	(27)	(114)
Balance as of end of period	572,064	768,124	628,186
Services
Goodwill [Roll Forward]
Balance as of beginning of period	762,419	628,186
Goodwill acquired	3,416	134,343
Measurement period adjustments	351	4
Impairment	(199,800)
Foreign currency translation	(27)	(114)
Balance as of end of period	566,359	762,419	628,186
True Health
Goodwill [Roll Forward]
Balance as of beginning of period	5,705	0
Goodwill acquired	0	5,826
Measurement period adjustments	0	(121)
Impairment	0
Foreign currency translation	0	0
Balance as of end of period	$ 5,705	$ 5,705	$ 0