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Income Taxes (Narrative) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Contingency [Line Items]        
Effective income tax rate 37.94% [1] 38.29% [1] 34.86%  
Reduction in its income tax provision resulting from the resolution of the tax matters     $ 10,900,000  
Excess tax benefits related to stock-based awards, which increased the cash flow from financing activities 6,200,000 7,100,000 3,000,000  
Net operating loss carryforwards for federal and state tax 14,900,000 9,400,000 20,700,000  
Company's total liability for uncertain tax positions 13,072,000 16,165,000 22,290,000 49,416,000
Uncertain tax positions recognized would favorably impact its effective tax rate 12,700,000      
Decrease in uncertain tax position 3,100,000 6,100,000    
Interest and penalties related to income tax liabilities 300,000 400,000 1,700,000  
Company's accrued liability for interest and penalties related to income tax liabilities 9,000,000 8,700,000    
Accounts payable and accrued expenses   3,242,000    
Increase in uncertain tax position 1,100,000      
Accounts Payable And Accrued Expenses [Member]
        
Income Tax Contingency [Line Items]        
Accounts payable and accrued expenses   3,200,000    
Other Liabilities [Member]
        
Income Tax Contingency [Line Items]        
Company's total liability for uncertain tax positions 22,100,000      
Other liabilities   21,700,000    
Other Liabilities [Member] | Accounts Payable And Accrued Expenses [Member]
        
Income Tax Contingency [Line Items]        
Company's total liability for uncertain tax positions   $ 24,900,000    
[1] The comparison of net income is affected by the change in the effective tax rate. The effective tax rate was 37.94% for the year ended December 31, 2012 as compared to 38.29% for the year ended December 31, 2011.