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Earnings Per Share - Additional Information (Detail) (Options to Purchase Common Stock [Member])	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Options to Purchase Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding options not included in diluted earnings per share	1,691,203	973,037

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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