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Earnings Per Common Share - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Decrease in income attributable to common shareholders	$ 0.3	$ 0.2	$ 0.8	$ 0.6
Option to purchase common stock shares not included in the computation of diluted EPS (in shares)	0.03		0.60	1.30

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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