Selected Financial Information by Reportable Operating Segment (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues		$ 889,053	$ 751,195	$ 1,669,024	$ 1,530,805
Adjusted EBITDA	[1]	221,603	170,679	415,033	382,559
Capital expenditures		82,426	91,613	162,589	182,800
U.S. Operating Segment
Segment Reporting Information [Line Items]
Revenues	[2]	709,074		1,305,417
International Operating Segment
Segment Reporting Information [Line Items]
Revenues		179,979		363,607
Operating Segments | U.S. Operating Segment
Segment Reporting Information [Line Items]
Revenues		712,483	554,929	1,312,128	1,136,138
Adjusted EBITDA		188,411	129,394	344,255	294,048
Capital expenditures		59,675	77,175	129,646	155,992
Operating Segments | International Operating Segment
Segment Reporting Information [Line Items]
Revenues		179,979	199,926	363,607	401,994
Adjusted EBITDA		33,192	41,285	70,778	88,511
Capital expenditures		22,751	14,438	32,943	26,808
Eliminations
Segment Reporting Information [Line Items]
Revenues		$ (3,409)	$ (3,660)	$ (6,711)	$ (7,327)

[1] The adoption of ASC Topic 606 impacted how the Company records certain revenues. See Note 3 for discussion of the impact of ASC Topic 606.

[2] U.S. segment revenues include eliminations of intercompany transactions with the international operating segment. See Note 15 for additional information on intercompany eliminations.