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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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