Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Provision for income taxes $ 44,000 $ 8,227,000 $ 235,000 $ 6,710,000
Unrecognized tax benefits     151,000  
Period of change of unrecognized tax benefits     12 months  
Accrued interest and penalties $ 0   $ 0