Selected Quarterly Financial Data (Unaudited) - Schedule of Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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	[1]	Dec. 31, 2018	Dec. 31, 2017	[2]
Quarterly Financial Information Disclosure [Abstract]
Revenues, net	$ 698,881	$ 681,048	$ 647,094	$ 621,825	$ 643,422	$ 619,586	$ 584,985	$ 585,500	$ 2,648,848		$ 2,433,492	$ 2,249,538
Operating income	320,796	329,141	297,317	284,176	284,738	281,090	264,783	260,087	1,231,430		1,090,698	883,760
Net income	$ 235,510	$ 225,805	$ 261,651	$ 172,107	$ 302,000	$ 157,694	$ 176,852	$ 174,937	$ 895,073	[3]	$ 811,483	$ 740,200	[4]
Earnings per share:
Basic earnings per share (in usd per share)	$ 2.72	$ 2.61	$ 3.03	$ 2.00	$ 3.45	$ 1.78	$ 1.98	$ 1.95	$ 10.36		$ 9.14	$ 8.12
Diluted earnings per share (in usd per share)	$ 2.60	$ 2.49	$ 2.90	$ 1.93	$ 3.33	$ 1.71	$ 1.91	$ 1.88	$ 9.94		$ 8.81	$ 7.91
Weighted average shares outstanding:
Basic (in shares)	86,600	86,662	86,360	85,941	87,636	88,456	89,169	89,765	86,401		88,750	91,129
Diluted (in shares)	90,427	90,522	90,131	89,244	90,703	92,081	92,702	93,250	90,070		92,151	93,594

[1] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019, using a modified retrospective transition method. Under this method, financial results reported in periods prior to 2019 are unchanged. Refer to footnote 14.

[2] The Company applied the modified retrospective transition method when adopting ASC 606, therefore the Company's 2017 prior period results were not restated to reflect ASC 606.

[3] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019 using the modified retrospective transition method. The adoption of the Leases guidance resulted in an adjustment to other assets, other current liabilities and other noncurrent liabilities in our consolidated balance sheet for the cumulative effect of applying the standard. Financial results reported in periods prior to 2019 are unchanged.

[4] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-18, Statement of Cash Flows (Topic 230), which was adopted by the Company on January 1, 2018 and applied retrospectively to results for 2017. The adoption of Topic 230 resulted in the statement of cash flows presenting the changes in the total of cash, cash equivalents and restricted cash. As a result, the Company will no longer present transfers between cash and cash equivalents and restricted cash in the statement of cash flows.