Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Combinations [Abstract]
Revenues	$ 2,766,950	$ 2,968,237
Gross profit	333,402	397,098
Selling, general and administrative expenses	231,102	243,857
Amortization of intangible assets	18,067	22,212
Net income	42,004	127,083
Net income attributable to common stock	$ 39,187	$ 126,536
Earnings per share:
Basic (in dollars per share)	$ 0.27	$ 0.87
Diluted (in dollars per share)	$ 0.27	$ 0.86