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Net Income Per Share - Additional Information (Details) (Stock Options)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options not included in the earnings per share calculation (in shares)	367,576	648,182

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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