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Guarantor Subsidiaries Financial Information Gurantor Subsidiaries Statement of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Net Income (Loss) Attributable to Parent [Abstract] |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ (33,502) | $ (96,458)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 3,502 | (2,484)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (9,814)
Other Comprehensive Income (Loss), Net of Tax | 3,502 | (12,298)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | (30,000) | (108,756)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 5,452 | 1,114
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | (35,452) | (109,870)
Parent Issuer [Member] |  |
Net Income (Loss) Attributable to Parent [Abstract] |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (38,966) | (97,572)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 3,502 | (2,484)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0 | (9,814)
Other Comprehensive Income (Loss), Net of Tax | 3,502 | (12,298)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | (35,464) | (109,870)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0 | 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | (35,464) | (109,870)
CNX Gas Guarantor [Member] |  |
Net Income (Loss) Attributable to Parent [Abstract] |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (56,344) | (13,524)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 0 | 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (9,814)
Other Comprehensive Income (Loss), Net of Tax | 0 | (9,814)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | (56,344) | (23,338)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0 | 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | (56,344) | (23,338)
Other Guarantors Subsidiaries [Member] |  |
Net Income (Loss) Attributable to Parent [Abstract] |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 39,256 | (2,212)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 3,541 | (2,459)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0
Other Comprehensive Income (Loss), Net of Tax | 3,541 | (2,459)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | 42,797 | (4,671)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0 | 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 42,797 | (4,671)
CNX Coal Resources LP [Member] |  |
Net Income (Loss) Attributable to Parent [Abstract] |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 14,066 | 3,816
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (39) | (25)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0
Other Comprehensive Income (Loss), Net of Tax | (39) | (25)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | 14,027 | 3,791
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0 | 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 14,027 | 3,791
Non-Guarantors [Member] |  |
Net Income (Loss) Attributable to Parent [Abstract] |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 0 | (53,181)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 0 | 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0
Other Comprehensive Income (Loss), Net of Tax | 0 | 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | 0 | (53,181)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0 | 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 0 | (53,181)
Consolidation, Eliminations [Member] |  |
Net Income (Loss) Attributable to Parent [Abstract] |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 8,486 | 66,215
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (3,502) | 2,484
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 9,814
Other Comprehensive Income (Loss), Net of Tax | (3,502) | 12,298
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | 4,984 | 78,513
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 5,452 | 1,114
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | $ (468) | $ 77,399

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