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Components of Income Tax Provision (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Federal income tax expense (benefit):      
Current $ 16,336 $ (77,310) $ (117,493)
Deferred 146,842 145,198 103,574
Federal Income Tax Expense (Benefit), Continuing Operations, Total 163,178 67,888 (13,919)
State income tax expense (benefit):      
Current 6,056 19 (1,883)
Deferred 13,196 3,246 (1,875)
State and Local Income Tax Expense (Benefit), Continuing Operations, Total 19,252 3,265 (3,758)
Foreign income tax expense (benefit):      
Current 6,579 2,657 338
Deferred (1,071) (954) (256)
Foreign Income Tax Expense (Benefit), Continuing Operations, Total 5,508 1,703 82
Total income tax expense (benefit):      
Current 28,971 (74,634) (119,038)
Deferred 158,967 147,490 101,443
Total income tax expense (benefit) $ 187,938 $ 72,856 $ (17,595)