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Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Sep. 30, 2012
Additional Paid-In Capital [Member]
Sep. 30, 2012
Retained Earnings [Member]
Sep. 30, 2012
Treasury Stock [Member]
Sep. 30, 2012
Deferred Compensation Trust [Member]
Sep. 30, 2012
Deferred Compensation Liability [Member]
Schedule Of Stockholders Equity [Line Items]                      
Balance, December 31, 2011     $ 1,374,799   $ 206 $ 206 $ 1,072,779 $ 4,158,492 $ (3,856,678) $ (25,581) $ 25,581
Net income 53,000 43,409 119,961 97,028       119,961      
Deferred compensation activity                   250 (250)
Purchase of common stock for treasury     (220,128)           (220,128)    
Equity-based compensation     50,136       50,136        
Tax benefit from equity benefit plan activity     5,687       5,687        
Proceeds from stock options exercised     48,853 106,007     48,853        
Treasury stock issued upon option exercise and restricted share vesting             (43,149)   43,149    
Balance, September 30, 2012 $ 1,379,308   $ 1,379,308   $ 206 $ 206 $ 1,134,306 $ 4,278,453 $ (4,033,657) $ (25,331) $ 25,331