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Accounts Receivable (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Activities in allowance for bad debt      
Charges to provision for bad debt $ (8,173,000) $ (4,262,000) $ (4,552,000)
Accounts receivable, net of allowance 2,160,561,000 1,386,700,000  
Related party transactions      
Net receivables due from Signature 25,700,000 21,200,000 10,400,000
Page Avjet Fuel Co. LLC (PAFCO), a controlled subsidiary
      
Related party transactions      
Sales to Signature 388,500,000 233,300,000 107,700,000
Allowance for bad debt
      
Activities in allowance for bad debt      
Balance at beginning of period 20,201,000 19,690,000 23,271,000
Charges to provision for bad debt 8,173,000 4,262,000 4,552,000
Write-off of uncollectible accounts receivable (4,681,000) (4,291,000) (8,800,000)
Recoveries of bad debt 608,000 540,000 667,000
Balance at end of period $ 24,301,000 $ 20,201,000 $ 19,690,000