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Net Income Per Share - Additional Information (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share Disclosure [Line Items]        
Average diluted shares outstanding 759 504 636 538
Debt Instrument, Convertible, Conversion Price $ 11.70   $ 11.70