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Summary of Provision for Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current      
Federal $ 30,375 $ 14,356 $ 14,959
State and local 4,331 3,230 2,303
Foreign 47 32 47
Current income tax expense, total 34,753 17,618 17,309
Deferred      
Federal 7,865 18,146 9,411
State and local 693 365 (85)
Foreign (7) (10)  
Deferred income tax expense, total 8,551 18,501 9,326
Total provision $ 43,304 $ 36,119 $ 26,635