Summary of Impact of Translating Financial Statements of Certain of Company's International Subsidiaries (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Foreign Currency Translation [Line Items]
Total Assets of the Company's Subsidiaries	$ 4,082,898		$ 4,082,898		$ 3,863,226
Other comprehensive Income (Loss)	(9,518)	7,354	(48,759)	(16,086)
Brazil
Foreign Currency Translation [Line Items]
Exchange Rate	2.28		2.28		2.05
Total Assets of the Company's Subsidiaries	330,871		330,871
Other comprehensive Income (Loss)			(24,042)
Argentina
Foreign Currency Translation [Line Items]
Exchange Rate	5.74		5.74		4.91
Total Assets of the Company's Subsidiaries	128,482		128,482
Other comprehensive Income (Loss)			(15,347)
Mexico
Foreign Currency Translation [Line Items]
Exchange Rate	13.08		13.08		13.02
Total Assets of the Company's Subsidiaries	117,884		117,884
Other comprehensive Income (Loss)			(888)
Colombia
Foreign Currency Translation [Line Items]
Exchange Rate	1,919.51		1,919.51		1,768.23
Total Assets of the Company's Subsidiaries	54,619		54,619
Other comprehensive Income (Loss)			(2,742)
Peru
Foreign Currency Translation [Line Items]
Exchange Rate	2.83		2.83		2.56
Total Assets of the Company's Subsidiaries	41,480		41,480
Other comprehensive Income (Loss)			(3,461)
All Other
Foreign Currency Translation [Line Items]
Other comprehensive Income (Loss)			(2,059)
Total International Subsidiaries
Foreign Currency Translation [Line Items]
Other comprehensive Income (Loss)			$ (48,539)