Segment Information - Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,524,281	$ 1,437,451	$ 844,706	$ 708,372	$ 1,606,915	$ 1,560,983	$ 976,177	$ 737,418	$ 3,274,578	$ 4,514,810	$ 4,881,493	$ 5,453,150
North American Region
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										2,763,299	3,010,598	3,626,099
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										2,600,000	2,820,000	3,390,000
Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										1,013,983	1,054,788	1,066,263
Latin America
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										653,992	675,286	636,535
Global Emerging Markets
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										644,255	773,453	744,817
Reconciling Adjustments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										$ (560,719)	$ (632,632)	$ (620,564)