Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v2.4.0.6
Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended
May 17, 2013
Apr. 23, 2013
Subsequent Event [Member]
   
Subsequent Event [Line Items]    
Sale of common shares   13,333,333
Sale of common stock price per share   $ 12.50
Net proceeds from offerings $ 9.5 $ 155.4
Purchase of additional stock of common shares 818,356