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Earning Per Share - Additional Information (Detail)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive stock options outstanding 347,000 372,000
Shares of common stock issued upon vesting of restricted stock 291,000 232,000
Convertible Notes Due 2017
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Long-term debt 1.75%