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Stock - Based Compensation - Additional Information (Detail)
6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Share Based Compensation [Line Items]              
Expected dividend yield 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%