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Earnings Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
Earnings Per Share - Additional Information (Detail)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Options
Earnings Per Share Basic [Line Items]
Anti-dilutive securities excluded from computation	1,643,950	757,687	1,643,950	737,033
Restricted Share Units
Earnings Per Share Basic [Line Items]
Anti-dilutive securities excluded from computation	57,591		51,106
Performance Share Units
Earnings Per Share Basic [Line Items]
Anti-dilutive securities excluded from computation	67,585		51,988

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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