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Summary of Stock Appreciation Rights Activity (Detail) (Stock Appreciation Rights, USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Stock Appreciation Rights
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares, Grants outstanding at beginning of the period 170,000 170,000 170,000 170,000
Shares, Grants outstanding at end of the period 170,000 170,000 170,000 170,000
Shares, Grants exercisable at end of the period 61,041       
Weighted Average Exercise Price per Share, Grants outstanding at beginning of the period $ 18.18 $ 18.18 $ 18.18 $ 18.18
Weighted Average Exercise Price per Share, Grants outstanding at end of the period $ 18.18 $ 18.18 $ 18.18 $ 18.18
Weighted Average Exercise Price per Share, Grants exercisable at end of the period $ 17.60