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Earnings Per Share - Number of Shares Underlying Stock Options Excluded from Computation of Diluted Loss (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options	0.2	2.0	2.1
Average exercise price	$ 26.83	$ 21.47	$ 16.70
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options	0.1
Minimum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Years of expiration	2023	2014	2013
Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Years of expiration	2023	2022	2022

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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