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Components of Consolidated Income Tax Provision (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components Of Income Tax Expense Benefit [Line Items]      
U.S., Current $ 27,100 $ 41,452 $ 44,595
State and local, Current 6,437 16,678 23,653
Total current provision for taxes 33,537 58,130 68,248
U.S., Deferred 180,997 29,895 (117,945)
State and local, Deferred 2,205 (2,548) (2,634)
Total deferred provision for taxes 183,202 27,347 (120,579)
Total provision (benefit) for taxes $ 216,739 $ 85,477 $ (52,331)