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Earnings Per Share - Additional Information (Detail)	3 Months Ended
Earnings Per Share - Additional Information (Detail)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Antidilutive stock options outstanding	204,000	242,000
Shares of common stock issued upon vesting of restricted stock	370,000	333,000
1.75% Senior Convertible Notes due 2017 [Member]
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
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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