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Commitments, Contingencies and Other Matters - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]  
Letters of credit, collateral for retrospective premiums and retained losses $ 39,800,000
Commitments to purchase major equipment 171,000,000
Current obligation 26,700,000
Obligation for remainder of the year 7,000,000
Self-insured retention 2,000,000
Workers' compensation and automobile liability insurance coverage, deductible per occurrence 1,000,000
Non Revolving Senior Secured Term Loan
  
Commitments and Contingencies Disclosure [Line Items]  
Advance to non-affiliates 12,000,000
Notes receivable interest rate 5.00%
Notes receivable 10,400,000
Repayment of notes receivable 397,000
Notes receivable outstanding $ 10,000,000