Selected Financial Information by Reportable Operating Segment (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues		$ 754,235	$ 710,748	$ 2,423,259	$ 2,241,553
Adjusted EBITDA	[1]	168,392	153,672	583,425	536,231
Capital expenditures		83,373	79,930	245,962	262,730
U.S. Operating Segment
Segment Reporting Information [Line Items]
Revenues	[2]	582,275		1,887,692
International Operating Segment
Segment Reporting Information [Line Items]
Revenues		171,960		535,567
Operating Segments | U.S. Operating Segment
Segment Reporting Information [Line Items]
Revenues		585,536	514,376	1,897,664	1,650,514
Adjusted EBITDA		132,652	108,854	476,907	402,902
Capital expenditures		65,458	65,612	195,104	221,604
Operating Segments | International Operating Segment
Segment Reporting Information [Line Items]
Revenues		171,960	200,122	535,567	602,116
Adjusted EBITDA		35,740	44,818	106,518	133,329
Capital expenditures		17,915	14,318	50,858	41,126
Eliminations
Segment Reporting Information [Line Items]
Revenues		$ (3,261)	$ (3,750)	$ (9,972)	$ (11,077)

[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.