Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (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]
Foreign currency translation adjustment, gross	$ (50,931)
Other comprehensive income (loss), gross total	(23,210)	$ (10,574)	$ (6,045)
Income tax (expense) benefit related to items of other comprehensive income (loss)	(7,620)	3,996	2,321
Amounts reclassified, net of tax	8,546	5,148	2,317
Changes in fair value, net of taxes	11,555	(11,726)	(6,041)
Foreign currency translation adjustment, net	(50,931)
Other comprehensive income (loss), total, net of tax	(30,830)	(6,578)	(3,724)
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	6,654	5,093	4,581
Changes in fair value, gross	11,431	(7,746)	(6,448)
Amounts reclassified, tax effect	(1,715)	(1,938)	(1,757)
Changes in fair value, tax effect	(2,239)	2,926	2,478
Amounts reclassified, net of tax	4,939	3,155	2,824
Changes in fair value, net of taxes	9,192	(4,820)	(3,970)
Fuel [Member] | Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	5,832	3,217	(823)
Changes in fair value, gross	3,804	(11,138)	(3,355)
Amounts reclassified, tax effect	(2,225)	(1,224)	316
Changes in fair value, tax effect	(1,441)	4,232	1,284
Amounts reclassified, net of tax	3,607	1,993	(507)
Changes in fair value, net of taxes	$ 2,363	$ (6,906)	$ (2,071)