Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Components of Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment, gross	$ (43,474)	$ 53,193	$ (102,804)	$ 70,627
Other comprehensive income (loss), gross total	(41,194)	50,897	(89,887)	68,179
Foreign currency translation adjustment, tax
Income tax (benefit) expense related to items of other comprehensive income loss	(594)	(1,338)	(3,420)	930
Amounts reclassified, net of tax			(3,507)	2,575
Changes in fair value, net of tax			13,004	(4,093)
Foreign currency translation adjustment, net	(43,474)	53,193	(102,804)	70,627
Other comprehensive income (loss), total, net of tax	(41,788)	49,559	(93,307)	69,109
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	(1,273)	760	(1,872)	1,841
Changes in fair value, gross	3,196	(2,904)	14,965	(1,876)
Amounts reclassified, tax effect	337	(202)	496	(488)
Changes in fair value, tax effect	(847)	(1,194)	(3,965)	497
Amounts reclassified, net of tax	(936)	558	(1,376)	1,353
Changes in fair value, net of tax	2,349	(4,098)	11,000	(1,379)
Fuel [Member] | Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	(1,688)	1,012	(2,837)	1,976
Changes in fair value, gross	2,045	(1,164)	2,661	(4,389)
Amounts reclassified, tax effect	420	(386)	706	(754)
Changes in fair value, tax effect	(504)	444	(657)	1,675
Amounts reclassified, net of tax	(1,268)	626	(2,131)	1,222
Changes in fair value, net of tax	$ 1,541	$ (720)	$ 2,004	$ (2,714)