Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event - Additional Information (Detail)

v2.4.0.8
Subsequent Event - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended
Jul. 31, 2013
Jan. 31, 2013
Sep. 04, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]      
Repurchase of common stock     $ 25.0
Par value of Repurchased common stock $ 0.01 $ 0.01 $ 0.01
Date of repurchase program terminates     Jan. 31, 2015