Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Expenses [Line Items]      
Cash paid for income taxes $ 16,056,000 $ 35,655,000 $ 12,000,000
Refund of income taxes paid in prior years 479,000 379,000 99,828,000
Income tax receivable 47,884,000    
Recognized income tax expense for interest and penalties   300,000  
Internal Revenue Service (IRS)
      
Income Tax Expenses [Line Items]      
Net operating loss   13,800,000 29,100,000
Estimated tax payments 5,000,000    
Accrued Interest
      
Income Tax Expenses [Line Items]      
Accrued interest related to uncertain tax positions $ 0