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Income Taxes - Net Deferred Income Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current deferred income taxes:
Assets	$ 84,244	$ 51,570
Liabilities	(39,405)	(41,428)
Net current deferred income taxes	44,839	10,142
Non-current deferred income taxes:
Assets	87,089	89,129
Liabilities	(331,345)	(314,179)
Net non-current deferred income taxes	(244,256)	(225,050)
Total net deferred income tax liabilities	$ (199,417)	$ (214,908)

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