Annual report pursuant to Section 13 and 15(d)

Non-Controlling Interest - Analysis of Controlling and Non-Controlling Interest (Parenthetical) (Detail)

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Non-Controlling Interest - Analysis of Controlling and Non-Controlling Interest (Parenthetical) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended
May 23, 2013
Apr. 23, 2013
Equity [Abstract]    
Net proceeds received upon exercise by underwriters $ 9.5 $ 160.0
Underwriters shares of common stock 818,356