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Pension and Employee Benefit Plans - Components of Pension and Employee Benefit Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Pension plan [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 50 $ 17
Interest cost 357 78
Expected return on plan assets (488) (102)
Amortization of net actuarial loss 44 92
Net periodic benefit cost (gain) (37) 85
Health care plan [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 1 1
Amortization of gain (1) (4)
Net periodic benefit cost (gain)   $ (3)