Net Income Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Common stock equivalents excluded from the calculation of diluted loss per share due to decline in market price of stock	28,123	243,160	32,967	390,833