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Commitments Contingencies and Other Matters - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
Commitments and Contingencies Disclosure [Line Items]  
Letters of credit, collateral for retrospective premiums and retained losses $ 41,100,000
Commitments to purchase major equipment 73,500,000
Current obligation 26,500,000
Purchase obligations for 2016 9,500,000
Settlement of fund for eligible participants 12,300,000
Self-insured retention 2,000,000
Workers' compensation insurance policy, deductible per occurrence 1,500,000
Automobile liability insurance policy, deductible per occurrence 2,000,000
Equipment insurance policy, deductible per occurrence $ 1,000,000
Key Employees | Change in Control Agreements  
Commitments and Contingencies Disclosure [Line Items]  
Automatic renewal period 12 months
New term notification period 90 days
Chairman of the Board and Chief Executive Officer | Change in Control Agreements  
Commitments and Contingencies Disclosure [Line Items]  
Employee entitlement ratio 2.5
Continued coverage entitlement of welfare plan period 3 years
Senior Vice Presidents | Change in Control Agreements  
Commitments and Contingencies Disclosure [Line Items]  
Employee entitlement ratio 2
Continued coverage entitlement of welfare plan period 2 years
General Counsel | Change in Control Agreements  
Commitments and Contingencies Disclosure [Line Items]  
Employee entitlement ratio 1.5
Continued coverage entitlement of welfare plan period 2 years
Advances to Vendor  
Commitments and Contingencies Disclosure [Line Items]  
Advance to non-affiliates $ 11,800,000
Notes receivable interest rate 5.00%
Repayment of notes receivable $ 10,600,000
Notes receivable outstanding 1,200,000
Maximum | Advances to Vendor  
Commitments and Contingencies Disclosure [Line Items]  
Advance to non-affiliates 12,000,000
Letter of Credit  
Commitments and Contingencies Disclosure [Line Items]  
Amount drawn under letters of credit $ 0