(Guarantor Subsidiaries, Condensed Statement of Cash Flows) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	$ 413,525	$ 248,110	$ 329,107
Cash Flows from Investing Activities:
Capital Expenditures	(145,749)	(81,413)	(53,600)
(Investments in), net of Distributions from, Subsidiaries	0
Proceeds from Sales of Assets	2,103	24,582	7,842
Other Investing Activity	(10,000)	0	0
Net Cash Used in Investing Activities	(153,646)	(56,831)	(45,758)
Cash Flows from Financing Activities:
(Payments on) Proceeds from Capitalized Leases/Miscellaneous Borrowings	(15,484)	(3,904)	431
Affiliated Credit Facility	0	0
Net (Payments on) Proceeds from Revolver - MLP	0	(201,000)	16,000
Distributions to Noncontrolling Interest	(22,265)	(21,892)	(21,657)
Shares/Units Withheld for Taxes	(3,424)	(2,156)	0
Repurchases of Common Stock	(25,839)	0	0
Purchases of CCR Units	(3,079)	0	0
Change in Parent Net Investment	0	(156,502)	(270,969)
Spin Distribution to CNX Resources Corporation	(18,234)	(425,000)	0
Premium Paid on Extinguishment of Debt	(2,458)	0	0
Debt Issuance and Financing Fees	(2,166)	(32,304)	(482)
Net Cash Provided by (Used in) Financing Activities	(148,923)	(50,611)	(276,677)
Elimination
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	0	0	0
Cash Flows from Investing Activities:
Capital Expenditures	0	0	0
(Investments in), net of Distributions from, Subsidiaries	(35,124)
Proceeds from Sales of Assets	0	0	0
Other Investing Activity	0
Net Cash Used in Investing Activities	(35,124)	0	0
Cash Flows from Financing Activities:
(Payments on) Proceeds from Capitalized Leases/Miscellaneous Borrowings	0	0	0
Affiliated Credit Facility		(196,583)
Net (Payments on) Proceeds from Revolver - MLP		0	0
Distributions to Noncontrolling Interest	35,124	34,508	42,634
Shares/Units Withheld for Taxes	0	0
Repurchases of Common Stock	0
Purchases of CCR Units	0	162,075	0
Change in Parent Net Investment		0	0
Spin Distribution to CNX Resources Corporation		0
Premium Paid on Extinguishment of Debt	0
Debt Issuance and Financing Fees	0	0	0
Net Cash Provided by (Used in) Financing Activities	35,124	0	42,634
Parent Issuer | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	231,522	(17,032)	253
Cash Flows from Investing Activities:
Capital Expenditures	0	0	0
(Investments in), net of Distributions from, Subsidiaries	(2,908)
Proceeds from Sales of Assets	0	0	0
Other Investing Activity	(10,000)
Net Cash Used in Investing Activities	(12,908)	0	0
Cash Flows from Financing Activities:
(Payments on) Proceeds from Capitalized Leases/Miscellaneous Borrowings	(2,905)	(3,503)	231
Affiliated Credit Facility	33,583	0
Net (Payments on) Proceeds from Revolver - MLP		0	0
Distributions to Noncontrolling Interest	0	0	0
Shares/Units Withheld for Taxes	0	0
Repurchases of Common Stock	(25,839)
Purchases of CCR Units	(3,079)	(5,573)	270,969
Change in Parent Net Investment		(156,502)	(270,969)
Spin Distribution to CNX Resources Corporation	(18,234)	(425,000)
Premium Paid on Extinguishment of Debt	(2,458)
Debt Issuance and Financing Fees	(2,166)	(32,304)	(482)
Net Cash Provided by (Used in) Financing Activities	(77,072)	169,265	(251)
Guarantor | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	56,624	192,423	255,756
Cash Flows from Investing Activities:
Capital Expenditures	(114,606)	(61,917)	(40,896)
(Investments in), net of Distributions from, Subsidiaries	38,032
Proceeds from Sales of Assets	1,933	23,082	7,819
Other Investing Activity	0
Net Cash Used in Investing Activities	(74,641)	(38,835)	(33,077)
Cash Flows from Financing Activities:
(Payments on) Proceeds from Capitalized Leases/Miscellaneous Borrowings	(9,527)	(305)	279
Affiliated Credit Facility	0	0
Net (Payments on) Proceeds from Revolver - MLP		0	0
Distributions to Noncontrolling Interest	0	0	(21,657)
Shares/Units Withheld for Taxes	(2,512)	(171)
Repurchases of Common Stock	0
Purchases of CCR Units	0	(156,502)	(270,969)
Change in Parent Net Investment		0	0
Spin Distribution to CNX Resources Corporation	0	0
Premium Paid on Extinguishment of Debt	0
Debt Issuance and Financing Fees	0	0	0
Net Cash Provided by (Used in) Financing Activities	(12,039)	(156,978)	(292,347)
Non-Guarantor | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	0	75	0
Cash Flows from Investing Activities:
Capital Expenditures	0	0	0
(Investments in), net of Distributions from, Subsidiaries	0
Proceeds from Sales of Assets	0	0	0
Other Investing Activity	0
Net Cash Used in Investing Activities	0	0	0
Cash Flows from Financing Activities:
(Payments on) Proceeds from Capitalized Leases/Miscellaneous Borrowings	0	0	0
Affiliated Credit Facility	0	0
Net (Payments on) Proceeds from Revolver - MLP		0	0
Distributions to Noncontrolling Interest	0	0	0
Shares/Units Withheld for Taxes	0	0
Repurchases of Common Stock	0
Purchases of CCR Units	0	0	0
Change in Parent Net Investment		0	0
Spin Distribution to CNX Resources Corporation	0	0
Premium Paid on Extinguishment of Debt	0
Debt Issuance and Financing Fees	0	0	0
Net Cash Provided by (Used in) Financing Activities	0	0	0
CONSOL Coal Resources LP | Non-Guarantor | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	125,379	72,644	73,098
Cash Flows from Investing Activities:
Capital Expenditures	(31,143)	(19,496)	(12,704)
(Investments in), net of Distributions from, Subsidiaries	0
Proceeds from Sales of Assets	170	1,500	23
Other Investing Activity	0
Net Cash Used in Investing Activities	(30,973)	(17,996)	(12,681)
Cash Flows from Financing Activities:
(Payments on) Proceeds from Capitalized Leases/Miscellaneous Borrowings	(3,052)	(96)	(79)
Affiliated Credit Facility	(33,583)	196,583
Net (Payments on) Proceeds from Revolver - MLP		(201,000)	16,000
Distributions to Noncontrolling Interest	(57,389)	(56,400)	(42,634)
Shares/Units Withheld for Taxes	(912)	(1,985)
Repurchases of Common Stock	0
Purchases of CCR Units	0	0	0
Change in Parent Net Investment		0	0
Spin Distribution to CNX Resources Corporation	0	0
Premium Paid on Extinguishment of Debt	0
Debt Issuance and Financing Fees	0	0	0
Net Cash Provided by (Used in) Financing Activities	(94,936)	(62,898)	(26,713)
Term Loan A
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	(26,250)	100,000	0
Term Loan A | Elimination
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt		0
Term Loan A | Parent Issuer | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	(26,250)	100,000
Term Loan A | Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	0	0
Term Loan A | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	0	0
Term Loan A | CONSOL Coal Resources LP | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	0	0
Term Loan B
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	(4,000)	392,147	0
Term Loan B | Elimination
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt		0
Term Loan B | Parent Issuer | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	(4,000)	392,147
Term Loan B | Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	0	0
Term Loan B | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	0	0
Term Loan B | CONSOL Coal Resources LP | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	0	0
Senior Secured Second Lien Notes due 2025
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	(25,724)	300,000	$ 0
Senior Secured Second Lien Notes due 2025 | Elimination
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt		0
Senior Secured Second Lien Notes due 2025 | Parent Issuer | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	(25,724)	300,000
Senior Secured Second Lien Notes due 2025 | Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	0	0
Senior Secured Second Lien Notes due 2025 | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	0	0
Senior Secured Second Lien Notes due 2025 | CONSOL Coal Resources LP | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
(Payments on) Proceeds from Debt	$ 0	$ 0