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