Business Combinations - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Two Thousand Twenty One Acquisition
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenues	$ 3,128,530	$ 2,751,167
Income before income taxes	779,533	653,270
Net income	$ 599,964	$ 502,942
Net income per share:
Basic	$ 2.13	$ 1.78
Diluted	$ 2.12	$ 1.77
Weighted average number of shares outstanding:
Basic	276,024	274,334
Diluted	277,414	275,867
Two Thousand Twenty Acquisition
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenues		$ 2,714,314	$ 2,579,075
Income before income taxes		650,618	576,355
Net income		$ 500,900	$ 436,722
Net income per share:
Basic		$ 1.77	$ 1.55
Diluted		$ 1.76	$ 1.54
Weighted average number of shares outstanding:
Basic		274,334	272,471
Diluted		275,867	274,616
Two Thousand Nineteen Acquisition
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Total revenues			$ 2,447,401
Income before income taxes			545,182
Net income			$ 412,974
Net income per share:
Basic			$ 1.47
Diluted			$ 1.46
Weighted average number of shares outstanding:
Basic			272,471
Diluted			274,616