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Components Of Income Tax Provision (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Federal income tax expense (benefit):      
Current $ (512) $ 16,336 $ (77,310)
Deferred 156,003 146,842 145,198
Federal Income Tax Expense (Benefit), Continuing Operations, Total 155,491 163,178 67,888
State income tax expense:      
Current 12,455 6,056 19
Deferred 5,483 13,196 3,246
State and Local Income Tax Expense (Benefit), Continuing Operations, Total 17,938 19,252 3,265
Foreign income tax expense (benefit):      
Current 3,817 6,579 2,657
Deferred (1,050) (1,071) (954)
Foreign Income Tax Expense (Benefit), Continuing Operations, Total 2,767 5,508 1,703
Total income tax expense (benefit):      
Current 15,760 28,971 (74,634)
Deferred 160,436 158,967 147,490
Total income tax expense: $ 176,196 $ 187,938 $ 72,856