Summary of Impact of Translating Financial Statements of Certain of Company's International Subsidiaries (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Foreign Currency Translation [Line Items]
Total Assets of the Company's Subsidiaries	$ 4,111,617		$ 4,111,617		$ 3,863,226
Other comprehensive Income (Loss)	(40,827)	(39,239)	(39,241)	(23,440)
Brazil
Foreign Currency Translation [Line Items]
Exchange Rate	2.24		2.24		2.05
Total Assets of the Company's Subsidiaries	316,659		316,659
Other comprehensive Income (Loss)			(21,344)
Argentina
Foreign Currency Translation [Line Items]
Exchange Rate	5.43		5.43		4.91
Total Assets of the Company's Subsidiaries	129,194		129,194
Other comprehensive Income (Loss)			(9,265)
Mexico
Foreign Currency Translation [Line Items]
Exchange Rate	12.95		12.95		13.02
Total Assets of the Company's Subsidiaries	117,847		117,847
Other comprehensive Income (Loss)			518
Colombia
Foreign Currency Translation [Line Items]
Exchange Rate	1,929.00		1,929.00		1,768.23
Total Assets of the Company's Subsidiaries	52,166		52,166
Other comprehensive Income (Loss)			(2,984)
Peru
Foreign Currency Translation [Line Items]
Exchange Rate	2.85		2.85		2.56
Total Assets of the Company's Subsidiaries	38,868		38,868
Other comprehensive Income (Loss)			(3,800)
All other
Foreign Currency Translation [Line Items]
Other comprehensive Income (Loss)			(2,251)
Total International Subsidiaries
Foreign Currency Translation [Line Items]
Other comprehensive Income (Loss)			$ (39,126)