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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2009
Sep. 30, 2012
Summary Of Significant Accounting Policies [Line Items]    
Depreciation and amortization expense   $ 1,528
Period to carry back net operating losses   up to 5 years
IRS Tax Refund 40,418  
Refunds in excess are required to be reviewed by Joint Committee on Taxation   2,000
Agreed refund adjustment to taxable income   13,700
Reduction in amount of refund   4,800
Interest repay to IRS   500
Reserve related to income tax expense   $ 5,300