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Stock Based Compensation - Summary of Nonvested Common Stock Units and Share Awards (Detail) (Nonvested Common Stock Share Awards [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nonvested Common Stock Share Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested Shares, beginning balance 13    
Granted, Shares 37 42 21
Vested, Shares (41)    
Forfeited or expired, Shares       
Nonvested Shares, ending balance 9 13  
Nonvested, Weighted Average Grant-Date Fair Value, beginning balance $ 17.18    
Granted, Weighted Average Grant-Date Fair Value $ 16.01 $ 16.15 $ 21.83
Vested, Weighted Average Grant-Date Fair Value $ 16.38    
Forfeited or expired, Weighted Average Grant-Date Fair Value       
Nonvested, Weighted Average Grant-Date Fair Value, ending balance $ 16.01 $ 17.18