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Pension and Employee Benefit Plans - Additional Information (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Plans
Defined Benefit Plan Disclosure [Line Items]      
Number Of Defined Benefit Pension Plans, acquired     2
Defined benefit plan contributions $ 1,400,000 $ 200,000  
Unfunded liability plans 5,300,000   6,600,000
Pension Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Anticipated contribution to fund the pension plan during the reminder of the fiscal year 500,000    
Health Care Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Anticipated contribution to fund the pension plan during the reminder of the fiscal year $ 21,000.0