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Equity Based Plans - Summary of Stock Options Outstanding and Exercisable (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Range Of Exercise Price One [Member]
Dec. 31, 2013
Range Of Exercise Price Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise Prices         $ 12.60 $ 18.42
Outstanding stock options 38,700 75,840 348,810 723,890 400 38,300
Exercisable Options 38,700 75,840 348,810   400 38,300