Other Comprehensive Income (Loss) (Amounts Included in Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (12,171)	$ (5,593)
Amounts reclassified into earnings	8,546	5,148	$ 2,317
Changes in fair value	11,555	(11,726)	(6,041)
Foreign currency translation adjustment	(50,931)
Ending balance	(43,001)	(12,171)	(5,593)
Foreign Currency Translation Adjustment [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment	(50,931)
Ending balance	(50,931)
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,037)	(4,372)
Amounts reclassified into earnings	4,939	3,155	2,824
Changes in fair value	9,192	(4,820)	(3,970)
Ending balance	8,094	(6,037)	(4,372)
Fuel [Member] | Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,134)	(1,221)
Amounts reclassified into earnings	3,607	1,993	(507)
Changes in fair value	2,363	(6,906)	(2,071)
Ending balance	$ (164)	$ (6,134)	$ (1,221)