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Guarantor Subsidiaries Balance Sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Current Assets: |  |  |  |
Cash and Cash Equivalents | $ 60,475 | $ 72,574 | $ 176,985 | $ 327,420
Accounts and Notes Receivable: |  |  |  |
Trade | 220,222 | 151,383 |  |
Inventories | 65,461 | 66,792 |  |
Income Taxes Receivable, Current | 116,851 | 13,887 |  |
Prepaid Expenses | 93,146 | 297,287 |  |
Other Receivables, Net, Current | 69,901 | 121,735 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 83 | 81,105 |  |
Total Current Assets | 626,139 | 804,763 |  |
Property, Plant and Equipment: |  |  |  |
Property, Plant and Equipment, Gross | 13,771,388 | 13,794,907 |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 5,630,949 | 5,062,201 |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 0 | 936,671 |  |
Total Property, Plant and Equipment-Net | 8,140,439 | 9,669,377 |  |
Other Assets: |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 190,964 | 237,330 |  |
Other | 222,149 | 214,388 |  |
Disposal Group, Including Discontinued Operation, Other Assets | 0 | 4,044 |  |
Total Assets | 9,183,981 | 10,929,902 | $ 11,654,646 |
Other Assets | 417,403 | 455,762 |  |
Current Liabilities: |  |  |  |
Other Accrued Liabilities, Current | 680,348 | 421,827 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 6,050 | 51,514 |  |
Accounts Payable | 241,616 | 250,609 |  |
Accounts Payable (Recoverable)- Related Parties | 0 | 0 |  |
Total Current Liabilities | 940,014 | 1,685,359 |  |
Short-Term Notes Payable (Note 12) | 0 | 952,000 |  |
Long-term Debt, Excluding Current Maturities | 2,722,995 | 2,703,899 |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  | 2,738,783 |  |
Disposal Group, Including Discontinued Operation, Liabilities | 0 | 5,001 |  |
Long-term Debt and Capital Lease Obligations | 2,762,069 | 2,743,784 |  |
Deferred Credits and Other Liabilities |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent | 0 | 74,629 |  |
Postretirement Benefits Other Than Pensions | 659,474 | 630,892 |  |
Pneumoconiosis | 108,073 | 111,903 |  |
Mine Closing | 218,631 | 227,339 |  |
Gas Well Closing | 223,352 | 163,842 |  |
Workers' Compensation | 67,277 | 69,812 |  |
Salary Retirement | 112,543 | 91,596 |  |
Reclamation | 0 | 25 |  |
Other | 151,660 | 166,957 |  |
Noncontrolling Interest in Limited Partnerships | 142,493 | 153,749 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent | 0 | 107,988 |  |
Total deferred credits and other liabilities | 1,541,010 | 1,644,983 |  |
Long-term Debt and Capital Lease Obligations, Current | 12,000 | 9,409 |  |
Total CONSOL Energy Inc. Stockholders' Equity | 3,798,395 | 4,702,027 |  |
TOTAL LIABILITIES AND EQUITY | 9,183,981 | 10,929,902 |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 4,290 | 0 |  |
Parent Company [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 49,722 | 64,995 |  |
Accounts and Notes Receivable: |  |  |  |
Trade | 0 | 0 |  |
Inventories | 0 | 0 |  |
Income Taxes Receivable, Current | 175,877 | 72,913 |  |
Prepaid Expenses | 12,828 | 27,245 |  |
Other Receivables, Net, Current | 20,097 | 18,933 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 0 |  |
Total Current Assets | 258,524 | 184,086 |  |
Property, Plant and Equipment: |  |  |  |
Property, Plant and Equipment, Gross | 114,611 | 156,348 |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 84,788 | 111,367 |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  | 0 |  |
Total Property, Plant and Equipment-Net | 29,823 | 44,981 |  |
Other Assets: |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 7,974,260 | 10,563,985 |  |
Other | 19,960 | 53,529 |  |
Disposal Group, Including Discontinued Operation, Other Assets |  | 0 |  |
Total Assets | 8,308,471 | 10,846,581 |  |
Other Assets | 8,020,124 | 10,617,514 |  |
Current Liabilities: |  |  |  |
Other Accrued Liabilities, Current | 75,039 | 63,668 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 0 | 0 |  |
Accounts Payable | 48,666 | 32,245 |  |
Accounts Payable (Recoverable)- Related Parties | 1,832,908 | 2,650,732 |  |
Total Current Liabilities | 1,958,146 | 3,700,154 |  |
Short-Term Notes Payable (Note 12) |  | 952,000 |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  | 2,418,961 |  |
Disposal Group, Including Discontinued Operation, Liabilities |  | 0 |  |
Long-term Debt and Capital Lease Obligations | 2,421,511 | 2,418,961 |  |
Deferred Credits and Other Liabilities |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  | (122,547) |  |
Postretirement Benefits Other Than Pensions | 0 | 0 |  |
Pneumoconiosis | 0 | 0 |  |
Mine Closing | 0 | 0 |  |
Gas Well Closing | 0 | 0 |  |
Workers' Compensation | 0 | 0 |  |
Salary Retirement | 112,543 | 91,596 |  |
Reclamation |  | 0 |  |
Other | 17,876 | 56,390 |  |
Noncontrolling Interest in Limited Partnerships | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 0 |  |
Total deferred credits and other liabilities | 130,419 | 25,439 |  |
Long-term Debt and Capital Lease Obligations, Current | 1,533 | 1,509 |  |
Total CONSOL Energy Inc. Stockholders' Equity | 3,798,395 | 4,702,027 |  |
TOTAL LIABILITIES AND EQUITY | 8,308,471 | 10,846,581 |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 25,904 |  |  |
Cnx Gas Guarantor [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 83 | 75 |  |
Accounts and Notes Receivable: |  |  |  |
Trade | 124,509 | 72,664 |  |
Inventories | 15,301 | 13,815 |  |
Income Taxes Receivable, Current | (59,026) | (59,026) |  |
Prepaid Expenses | 60,500 | 244,680 |  |
Other Receivables, Net, Current | 34,773 | 99,001 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 0 |  |
Total Current Assets | 176,140 | 371,209 |  |
Property, Plant and Equipment: |  |  |  |
Property, Plant and Equipment, Gross | 8,851,226 | 8,875,027 |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 3,106,296 | 2,695,674 |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  | 0 |  |
Total Property, Plant and Equipment-Net | 5,744,930 | 6,179,353 |  |
Other Assets: |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 188,376 | 234,803 |  |
Other | 67,096 | 47,892 |  |
Disposal Group, Including Discontinued Operation, Other Assets |  | 0 |  |
Total Assets | 6,154,928 | 6,833,257 |  |
Other Assets | 233,858 | 282,695 |  |
Current Liabilities: |  |  |  |
Other Accrued Liabilities, Current | 337,374 | 102,753 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 0 | 0 |  |
Accounts Payable | 127,309 | 149,930 |  |
Accounts Payable (Recoverable)- Related Parties | 1,034,138 | 1,521,442 |  |
Total Current Liabilities | 1,505,190 | 1,780,923 |  |
Short-Term Notes Payable (Note 12) |  | 0 |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  | 33,141 |  |
Disposal Group, Including Discontinued Operation, Liabilities |  | 0 |  |
Long-term Debt and Capital Lease Obligations | 26,884 | 33,141 |  |
Deferred Credits and Other Liabilities |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  | 197,176 |  |
Postretirement Benefits Other Than Pensions | 0 | 0 |  |
Pneumoconiosis | 0 | 0 |  |
Mine Closing | 0 | 0 |  |
Gas Well Closing | 195,704 | 135,174 |  |
Workers' Compensation | 0 | 0 |  |
Salary Retirement | 0 | 0 |  |
Reclamation |  | 0 |  |
Other | 117,658 | 105,588 |  |
Noncontrolling Interest in Limited Partnerships | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 0 |  |
Total deferred credits and other liabilities | 313,362 | 437,938 |  |
Long-term Debt and Capital Lease Obligations, Current | 6,369 | 6,798 |  |
Total CONSOL Energy Inc. Stockholders' Equity | 4,309,492 | 4,581,255 |  |
TOTAL LIABILITIES AND EQUITY | 6,154,928 | 6,833,257 |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | (21,614) |  |  |
Other Guarantors Subsidiaries [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 0 | 0 |  |
Accounts and Notes Receivable: |  |  |  |
Trade | 72,295 | 59,321 |  |
Inventories | 38,669 | 40,739 |  |
Income Taxes Receivable, Current | 0 | 0 |  |
Prepaid Expenses | 16,306 | 20,273 |  |
Other Receivables, Net, Current | 14,516 | 3,330 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 0 |  |
Total Current Assets | 141,786 | 123,663 |  |
Property, Plant and Equipment: |  |  |  |
Property, Plant and Equipment, Gross | 3,928,861 | 3,898,005 |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 1,997,687 | 1,854,249 |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  | 0 |  |
Total Property, Plant and Equipment-Net | 1,931,174 | 2,043,756 |  |
Other Assets: |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 27,269 | 6,293 |  |
Other | 114,030 | 95,369 |  |
Disposal Group, Including Discontinued Operation, Other Assets |  | 0 |  |
Total Assets | 2,214,259 | 2,269,081 |  |
Other Assets | 141,299 | 101,662 |  |
Current Liabilities: |  |  |  |
Other Accrued Liabilities, Current | 223,705 | 218,186 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 0 | 0 |  |
Accounts Payable | 36,039 | 37,212 |  |
Accounts Payable (Recoverable)- Related Parties | (2,648,416) | (3,953,215) |  |
Total Current Liabilities | (2,384,662) | (3,696,776) |  |
Short-Term Notes Payable (Note 12) |  | 0 |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  | 105,611 |  |
Disposal Group, Including Discontinued Operation, Liabilities |  | 0 |  |
Long-term Debt and Capital Lease Obligations | 115,685 | 105,611 |  |
Deferred Credits and Other Liabilities |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  | 0 |  |
Postretirement Benefits Other Than Pensions | 659,474 | 630,892 |  |
Pneumoconiosis | 106,016 | 109,969 |  |
Mine Closing | 209,384 | 218,936 |  |
Gas Well Closing | 27,549 | 28,572 |  |
Workers' Compensation | 64,187 | 66,883 |  |
Salary Retirement | 0 | 0 |  |
Reclamation |  | 25 |  |
Other | 15,663 | 4,266 |  |
Noncontrolling Interest in Limited Partnerships | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 0 |  |
Total deferred credits and other liabilities | 1,082,273 | 1,059,543 |  |
Long-term Debt and Capital Lease Obligations, Current | 4,010 | 1,041 |  |
Total CONSOL Energy Inc. Stockholders' Equity | 3,400,963 | 4,800,703 |  |
TOTAL LIABILITIES AND EQUITY | 2,214,259 | 2,269,081 |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 0 |  |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 885 | 970 |  |
Accounts and Notes Receivable: |  |  |  |
Trade | 0 | 0 |  |
Inventories | 0 | 0 |  |
Income Taxes Receivable, Current | 0 | 0 |  |
Prepaid Expenses | 0 | 0 |  |
Other Receivables, Net, Current | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 83 | 81,105 |  |
Total Current Assets | 968 | 82,075 |  |
Property, Plant and Equipment: |  |  |  |
Property, Plant and Equipment, Gross | 0 | 0 |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  | 936,671 |  |
Total Property, Plant and Equipment-Net | 0 | 936,671 |  |
Other Assets: |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 0 | 0 |  |
Other | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Other Assets |  | 4,044 |  |
Total Assets | 968 | 1,022,790 |  |
Other Assets | 0 | 4,044 |  |
Current Liabilities: |  |  |  |
Other Accrued Liabilities, Current | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 6,050 | 51,514 |  |
Accounts Payable | 0 | 0 |  |
Accounts Payable (Recoverable)- Related Parties | (209,491) | (209,452) |  |
Total Current Liabilities | (203,441) | (157,938) |  |
Short-Term Notes Payable (Note 12) |  | 0 |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities |  | 5,001 |  |
Long-term Debt and Capital Lease Obligations | 0 | 5,001 |  |
Deferred Credits and Other Liabilities |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  | 0 |  |
Postretirement Benefits Other Than Pensions | 0 | 0 |  |
Pneumoconiosis | 0 | 0 |  |
Mine Closing | 0 | 0 |  |
Gas Well Closing | 0 | 0 |  |
Workers' Compensation | 0 | 0 |  |
Salary Retirement | 0 | 0 |  |
Reclamation |  | 0 |  |
Other | 0 | 0 |  |
Noncontrolling Interest in Limited Partnerships | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 107,988 |  |
Total deferred credits and other liabilities | 0 | 107,988 |  |
Long-term Debt and Capital Lease Obligations, Current | 0 | 0 |  |
Total CONSOL Energy Inc. Stockholders' Equity | 204,409 | 1,067,739 |  |
TOTAL LIABILITIES AND EQUITY | 968 | 1,022,790 |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 0 |  |  |
CNX Coal Resources LP [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 9,785 | 6,534 |  |
Accounts and Notes Receivable: |  |  |  |
Trade | 23,418 | 19,398 |  |
Inventories | 11,491 | 12,238 |  |
Income Taxes Receivable, Current | 0 | 0 |  |
Prepaid Expenses | 3,512 | 5,089 |  |
Other Receivables, Net, Current | 515 | 471 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 0 |  |
Total Current Assets | 48,721 | 43,730 |  |
Property, Plant and Equipment: |  |  |  |
Property, Plant and Equipment, Gross | 876,690 | 865,527 |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 442,178 | 400,911 |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  | 0 |  |
Total Property, Plant and Equipment-Net | 434,512 | 464,616 |  |
Other Assets: |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 0 | 0 |  |
Other | 21,063 | 17,598 |  |
Disposal Group, Including Discontinued Operation, Other Assets |  | 0 |  |
Total Assets | 504,296 | 525,944 |  |
Other Assets | 21,063 | 17,598 |  |
Current Liabilities: |  |  |  |
Other Accrued Liabilities, Current | 44,230 | 37,220 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 0 | 0 |  |
Accounts Payable | 18,797 | 17,405 |  |
Accounts Payable (Recoverable)- Related Parties | 1,666 | 4,310 |  |
Total Current Liabilities | 64,781 | 58,996 |  |
Short-Term Notes Payable (Note 12) |  | 0 |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  | 181,070 |  |
Disposal Group, Including Discontinued Operation, Liabilities |  | 0 |  |
Long-term Debt and Capital Lease Obligations | 197,989 | 181,070 |  |
Deferred Credits and Other Liabilities |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  | 0 |  |
Postretirement Benefits Other Than Pensions | 0 | 0 |  |
Pneumoconiosis | 2,057 | 1,934 |  |
Mine Closing | 9,247 | 8,403 |  |
Gas Well Closing | 99 | 96 |  |
Workers' Compensation | 3,090 | 2,929 |  |
Salary Retirement | 0 | 0 |  |
Reclamation |  | 0 |  |
Other | 463 | 713 |  |
Noncontrolling Interest in Limited Partnerships | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 0 |  |
Total deferred credits and other liabilities | 14,956 | 14,075 |  |
Long-term Debt and Capital Lease Obligations, Current | 88 | 61 |  |
Total CONSOL Energy Inc. Stockholders' Equity | 226,570 | 271,803 |  |
TOTAL LIABILITIES AND EQUITY | 504,296 | 525,944 |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 0 |  |  |
Consolidation, Eliminations [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 0 | 0 |  |
Accounts and Notes Receivable: |  |  |  |
Trade | 0 | 0 |  |
Inventories | 0 | 0 |  |
Income Taxes Receivable, Current | 0 | 0 |  |
Prepaid Expenses | 0 | 0 |  |
Other Receivables, Net, Current | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 0 |  |
Total Current Assets | 0 | 0 |  |
Property, Plant and Equipment: |  |  |  |
Property, Plant and Equipment, Gross | 0 | 0 |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  | 0 |  |
Total Property, Plant and Equipment-Net | 0 | 0 |  |
Other Assets: |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | (7,998,941) | (10,567,751) |  |
Other | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Other Assets |  | 0 |  |
Total Assets | (7,998,941) | (10,567,751) |  |
Other Assets | (7,998,941) | (10,567,751) |  |
Current Liabilities: |  |  |  |
Other Accrued Liabilities, Current | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 0 | 0 |  |
Accounts Payable | 10,805 | 13,817 |  |
Accounts Payable (Recoverable)- Related Parties | (10,805) | (13,817) |  |
Total Current Liabilities | 0 | 0 |  |
Short-Term Notes Payable (Note 12) |  | 0 |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities |  | 0 |  |
Long-term Debt and Capital Lease Obligations | 0 | 0 |  |
Deferred Credits and Other Liabilities |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  | 0 |  |
Postretirement Benefits Other Than Pensions | 0 | 0 |  |
Pneumoconiosis | 0 | 0 |  |
Mine Closing | 0 | 0 |  |
Gas Well Closing | 0 | 0 |  |
Workers' Compensation | 0 | 0 |  |
Salary Retirement | 0 | 0 |  |
Reclamation |  | 0 |  |
Other | 0 | 0 |  |
Noncontrolling Interest in Limited Partnerships | 142,493 | 153,749 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 0 |  |
Total deferred credits and other liabilities | 0 | 0 |  |
Long-term Debt and Capital Lease Obligations, Current | 0 | 0 |  |
Total CONSOL Energy Inc. Stockholders' Equity | (8,141,434) | (10,721,500) |  |
TOTAL LIABILITIES AND EQUITY | (7,998,941) | $ (10,567,751) |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | $ 0 |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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