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)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Earnings Per Share [Abstract]      
Options to purchase Class A common stock 2,030,459 2,580,033 2,162,067
Dilutive shares 816,829 675,808