Quarterly Financial Information (Unaudited) - Summary of Quarterly Financial Results (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 941,422	$ 984,199	$ 1,000,006	$ 1,049,361	$ 923,928	$ 970,283	$ 984,376	$ 988,369	$ 3,974,988	$ 3,866,956	$ 3,598,484
Operating income	57,637	113,460	81,913	110,407	121,019	136,763	138,833	165,401	363,417	562,016	493,440
Income from continuing operations	11,824	65,180	28,094	59,214	87,028	70,879	92,565	90,449	164,312	340,921	249,576
(Loss) income from discontinued operations, net of tax	(1,068)	(596)	1,350	(1,452)	(1,478)	3,664	760	(1,207)	(1,766)	1,739	(1,932)
Net income	10,756	64,584	29,444	57,762	85,550	74,543	93,325	89,242	$ 162,546	$ 342,660	$ 247,644
Net income attributable to common stockholders	$ 10,091	$ 63,813	$ 27,838	$ 56,850	$ 84,400	$ 73,005	$ 92,246	$ 87,880
Net income per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.04	$ 0.24	$ 0.10	$ 0.20	$ 0.31	$ 0.26	$ 0.33	$ 0.32	$ 0.57	$ 1.23	$ 0.87
Diluted (in dollars per share)	$ 0.04	$ 0.23	$ 0.10	$ 0.20	$ 0.30	$ 0.26	$ 0.33	$ 0.32	$ 0.57	$ 1.22	$ 0.87