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Net Income Per Share of Common Stock (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock Issued During Period, Shares, Restricted Stock Award, Subject to Forfeiture 4,129,000 4,290,000 4,156,000 4,305,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 362,000 1,000 347,000 21,000