Net Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets And Liabilities [Line Items]
Current deferred taxes, Assets	$ 121,097	$ 105,639
Current deferred taxes, Liabilities	(1,194)	(1,178)
Total deferred taxes-current	119,903	104,461
Noncurrent deferred taxes, Assets	103,221	142,065
Noncurrent deferred taxes, Liabilities	(342,369)	(325,812)
Total deferred taxes-noncurrent	(239,148)	(183,747)
Net deferred income tax liabilities	$ (119,245)	$ (79,286)