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Weighted Average Shares - Additional Information (Detail)	12 Months Ended			0 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2013	Sep. 29, 2013
Class of Stock [Line Items]
Stock options to purchase anti-dilutive common stock	1,286,403	1,385,901	1,790,911
Common Stock [Member]
Class of Stock [Line Items]
Stock split ratio				2	2

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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