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Long-Term Debt - Outstanding Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total long-term debt $ 169,700 $ 122,000
Capital Lease Obligations 6,450 6,978
Total Long-term debt 176,157 128,945
Less: current maturities (11,113) (11,353)
Total long-term debt, net of current maturities 165,044 117,592
9.08% bond, due June 1, 2022 [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 7,969 [1] 7,967 [1]
7.83% note, due January 1, 2015 [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 2,000 2,000
6.64% note, due October 31, 2017 [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 10,909 10,909
5.50% note, due October 12, 2020 [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 14,000 14,000
5.93% note, due October 31, 2023 [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 28,500 30,000
5.68% note, due June 30, 2026 [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 29,000 29,000
Uncollateralized Senior Notes Due On May Two Thousand Twenty Eight [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 7,000 7,000
Uncollateralized Senior Note Two Due on December Two Thousand Twenty Eight [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 20,000 20,000
Uncollateralized Senior Notes Due On Two Thousand Twenty Nine [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 50,000  
8.25% due March 1, 2014 [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 0 646
Promissory note [Member]
   
Debt Instrument [Line Items]    
Total long-term debt $ 329 $ 445
[1] FPU secured first mortgage bonds are guaranteed by Chesapeake.