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Pension and Employee Benefit Plans - Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan contributions $ 400,000 $ 900,000  
Unfunded liability plans 10,700,000   $ 11,100,000
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Anticipated contribution to fund the pension plan during the reminder of the fiscal year 200,000    
Health Care Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Anticipated contribution to fund the pension plan during the reminder of the fiscal year $ 25,000