Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Share - Additional Information (Detail)

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Net Income (Loss) Per Share - Additional Information (Detail)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
class
Sep. 30, 2012
Earnings Per Share [Abstract]        
Total number of class of stock outstanding     2  
Common stock equivalents (shares) 3,515 3,457 3,098 5,221