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Income Per Common Share - Additional Information (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Options Held
     
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Antidilutive Securities Excluded from Computation of Diluted Income Per Common Share 1,417,145 1,450,200 1,600,413
4.75% Convertible Senior Notes
     
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Antidilutive Securities Excluded from Computation of Diluted Income Per Common Share     462,192
Debt instrument maturity date 2011-07