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Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Assets: |  |  |
Investments | $ 3,665 | $ 3,678 |
Equity Securities [Member] |  |  |
Assets: |  |  |
Investments | 16 | 0 |
Quoted Prices in Active Markets (Level 1) [Member] | Mark-to-market energy liabilities [Member] |  |  |
Liabilities: |  |  |
Mark-to-market energy liabilities | 0 | 0 |
Quoted Prices in Active Markets (Level 1) [Member] | Investments in guaranteed income fund [Member] |  |  |
Assets: |  |  |
Investments | 0 | 0 |
Quoted Prices in Active Markets (Level 1) [Member] | Equity Securities [Member] |  |  |
Assets: |  |  |
Investments | 16 |  |
Quoted Prices in Active Markets (Level 1) [Member] | Investments - other [Member] |  |  |
Assets: |  |  |
Investments | 3,314 | 3,391 |
Quoted Prices in Active Markets (Level 1) [Member] | Mark To Market Energy Assets Including Put Option [Member] |  |  |
Assets: |  |  |
Mark-to-market energy assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Mark-to-market energy liabilities [Member] |  |  |
Liabilities: |  |  |
Mark-to-market energy liabilities | 47 | 1,018 |
Significant Other Observable Inputs (Level 2) [Member] | Investments in guaranteed income fund [Member] |  |  |
Assets: |  |  |
Investments | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member] |  |  |
Assets: |  |  |
Investments | 0 |  |
Significant Other Observable Inputs (Level 2) [Member] | Investments - other [Member] |  |  |
Assets: |  |  |
Investments | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Mark To Market Energy Assets Including Put Option [Member] |  |  |
Assets: |  |  |
Mark-to-market energy assets | 358 | 1,055 |
Significant Unobservable Inputs (Level 3) [Member] | Mark-to-market energy liabilities [Member] |  |  |
Assets: |  |  |
Mark-to-market energy assets | 0 | 0 | $ 0
Significant Unobservable Inputs (Level 3) [Member] | Investments in guaranteed income fund [Member] |  |  |
Assets: |  |  |
Investments | 335 | 287 |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] |  |  |
Assets: |  |  |
Investments | 0 |  |
Significant Unobservable Inputs (Level 3) [Member] | Investments - other [Member] |  |  |
Assets: |  |  |
Investments | 0 | 0 |
Recurring [Member] | Mark-to-market energy liabilities [Member] |  |  |
Liabilities: |  |  |
Mark-to-market energy liabilities | 47 | 1,018 |
Recurring [Member] | Investments in guaranteed income fund [Member] |  |  |
Assets: |  |  |
Investments | 335 | 287 |
Recurring [Member] | Equity Securities [Member] |  |  |
Assets: |  |  |
Investments | 16 |  |
Recurring [Member] | Investments - other [Member] |  |  |
Assets: |  |  |
Investments | 3,314 | 3,391 |
Recurring [Member] | Mark To Market Energy Assets Including Put Option [Member] |  |  |
Assets: |  |  |
Mark-to-market energy assets | $ 358 | $ 1,055 |

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