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Weighted Average Common Shares - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Anti-dilutive awards excluded from computations of diluted earnings per share		4.2
Weighted average number of shares issued	0.1	0.1

X

- Definition

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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-Number 07-4

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Number of shares issued during the period as a result of an employee stock purchase plan.

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