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Pension and Employee Benefit Plans - Components of Pension and Employee Benefit Expenses (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Discount rate   4.25%
Expected return on assets 7.50% 7.50%
Compensation increase rate      
Minimum [Member]
    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Discount rate 3.75%  
Compensation increase rate     
Maximum [Member]
    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Discount rate 4.50%  
Compensation increase rate