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Earnings Per Share - Additional Information (Detail)	12 Months Ended
Earnings Per Share - Additional Information (Detail)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Weighted-average anti-dilutive potential common shares	621,327	916,756	1,057,925

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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