Deferred Tax Assets and Liabilities Recognized in Company's Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets And Liabilities [Line Items]
Deferred tax asset - other current assets	$ 32,293	$ 26,037
Deferred tax asset - other noncurrent assets	3,222	360
Total deferred tax assets	35,515	26,397
Deferred tax liability - accrued expenses		(167)
Noncurrent deferred tax liability - deferred income taxes	(121,349)	(142,482)
Total deferred tax liabilities	(121,349)	(142,649)
Net deferred tax liabilities	$ (85,834)	$ (116,252)