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Earnings Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended		1 Months Ended
Earnings Per Share - Additional Information (Detail)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	May 31, 2014 IPO [Member]	Sep. 30, 2014 1.75% Senior Convertible Notes due 2017 [Member]	Dec. 31, 2013 1.75% Senior Convertible Notes due 2017 [Member]	Sep. 30, 2013 1.75% Senior Convertible Notes due 2017 [Member]
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Antidilutive stock options outstanding	205,000	327,000	116,000	327,000
Shares of common stock issued upon vesting of restricted stock	10,000	22,000	382,000	358,000
Common stock issued					5,750,000
Interest rate						1.75%	1.75%	1.75%

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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