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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share Basic And Diluted [Abstract]
Antidilutive shares related to stock options excluded from the diluted share	1,373,087	1,648,719

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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