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Earnings Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
Earnings Per Share - Additional Information (Detail)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock options outstanding	327,000	369,000	327,000	369,000
Shares of common stock issued upon vesting of restricted stock	22,000	59,000	358,000	314,000
Convertible Notes Due 2017 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Long-term debt	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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