Quarterly report pursuant to Section 13 or 15(d)

Basic and Diluted Net Earnings Per Share - Additional Information (Detail)

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Basic and Diluted Net Earnings Per Share - Additional Information (Detail)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Earnings Per Share Disclosure [Line Items]      
Outstanding options to purchase shares 2,089,524 1,707,025 1,640,392
Dilutive shares 695,025 200,108