Annual report pursuant to Section 13 and 15(d)

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share Subsequent to IPO (Parenthetical) (Detail)

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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share Subsequent to IPO (Parenthetical) (Detail)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
DSU Settlement to Common Stock Percentage 20.00%
Fully vested deferred stock units 2.2