(Guarantor Subsidiaries Condensed Statement of Cash Flows) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used In) Operating Activities	$ 244,566	$ 413,525	$ 248,110
Cash Flows from Investing Activities:
Capital Expenditures	(169,739)	(145,749)	(81,413)
(Investments in), net of Distributions from, Subsidiaries	0	0
Proceeds from Sales of Assets	2,201	2,103	24,582
Other Investing Activity	(5,003)	(10,000)	0
Net Cash Used in Investing Activities	(172,541)	(153,646)	(56,831)
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations	(18,549)
Payments on Finance Lease Obligations		(15,484)	(3,904)
Affiliated Credit Facility	0	0	0
Net Payments on Revolver - MLP	0	0	(201,000)
Distributions to Noncontrolling Interest	(22,220)	(22,265)	(21,892)
Shares/Units Withheld for Taxes	(4,963)	(3,424)	(2,156)
Repurchases of Common Stock	(32,733)	(25,839)	0
Purchases of CCR Units	(369)	(3,079)	0
Spin Distribution to CNX Resources Corporation	0	(18,234)	(425,000)
Change in Parent Net Investment	0	0	(156,502)
Premium Paid on Extinguishment of Debt	(6,773)	(2,458)	0
Debt Issuance and Financing Fees	(12,492)	(2,166)	(32,304)
Net Cash Provided by (Used in) Financing Activities	(256,667)	(148,923)	(50,611)
Elimination
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used In) Operating Activities	0	0	0
Cash Flows from Investing Activities:
Capital Expenditures	0	0	0
(Investments in), net of Distributions from, Subsidiaries	(35,398)	(35,124)
Proceeds from Sales of Assets	0	0	0
Other Investing Activity	0	0
Net Cash Used in Investing Activities	(35,398)	(35,124)	0
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations	0
Payments on Finance Lease Obligations		0	0
Affiliated Credit Facility	0	0	(196,583)
Net Payments on Revolver - MLP			0
Distributions to Noncontrolling Interest	35,398	35,124	34,508
Shares/Units Withheld for Taxes	0	0	0
Repurchases of Common Stock	0	0
Purchases of CCR Units	0	0	162,075
Spin Distribution to CNX Resources Corporation		0	0
Change in Parent Net Investment			0
Premium Paid on Extinguishment of Debt	0	0
Debt Issuance and Financing Fees	0	0	0
Net Cash Provided by (Used in) Financing Activities	35,398	35,124	0
Parent Issuer | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used In) Operating Activities	253,112	231,522	(17,032)
Cash Flows from Investing Activities:
Capital Expenditures	0	0	0
(Investments in), net of Distributions from, Subsidiaries	(206,658)	(2,908)
Proceeds from Sales of Assets	0	0	0
Other Investing Activity	(5,003)	(10,000)
Net Cash Used in Investing Activities	(211,661)	(12,908)	0
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations	0
Payments on Finance Lease Obligations		(2,905)	(3,503)
Affiliated Credit Facility	(17,925)	33,583	0
Net Payments on Revolver - MLP			0
Distributions to Noncontrolling Interest	0	0	0
Shares/Units Withheld for Taxes	0	0	0
Repurchases of Common Stock	(32,733)	(25,839)
Purchases of CCR Units	(369)	(3,079)	(5,573)
Spin Distribution to CNX Resources Corporation		(18,234)	(425,000)
Change in Parent Net Investment			(156,502)
Premium Paid on Extinguishment of Debt	(6,773)	(2,458)
Debt Issuance and Financing Fees	(12,492)	(2,166)	(32,304)
Net Cash Provided by (Used in) Financing Activities	(228,860)	(77,072)	169,265
Guarantor | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used In) Operating Activities	(89,671)	56,624	192,423
Cash Flows from Investing Activities:
Capital Expenditures	(132,562)	(114,606)	(61,917)
(Investments in), net of Distributions from, Subsidiaries	242,056	38,032
Proceeds from Sales of Assets	2,195	1,933	23,082
Other Investing Activity	0	0
Net Cash Used in Investing Activities	111,689	(74,641)	(38,835)
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations	(14,708)
Payments on Finance Lease Obligations		(9,527)	(305)
Affiliated Credit Facility	0	0	0
Net Payments on Revolver - MLP			0
Distributions to Noncontrolling Interest	0	0	0
Shares/Units Withheld for Taxes	(4,083)	(2,512)	(171)
Repurchases of Common Stock	0	0
Purchases of CCR Units	0	0	(156,502)
Spin Distribution to CNX Resources Corporation		0	0
Change in Parent Net Investment			0
Premium Paid on Extinguishment of Debt	0	0
Debt Issuance and Financing Fees	0	0	0
Net Cash Provided by (Used in) Financing Activities	(18,791)	(12,039)	(156,978)
Non-Guarantor | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used In) Operating Activities	0	0	75
Cash Flows from Investing Activities:
Capital Expenditures	0	0	0
(Investments in), net of Distributions from, Subsidiaries	0	0
Proceeds from Sales of Assets	0	0	0
Other Investing Activity	0	0
Net Cash Used in Investing Activities	0	0	0
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations	0
Payments on Finance Lease Obligations		0	0
Affiliated Credit Facility	0	0	0
Net Payments on Revolver - MLP			0
Distributions to Noncontrolling Interest	0	0	0
Shares/Units Withheld for Taxes	0	0	0
Repurchases of Common Stock	0	0
Purchases of CCR Units	0	0	0
Spin Distribution to CNX Resources Corporation		0	0
Change in Parent Net Investment			0
Premium Paid on Extinguishment of Debt	0	0
Debt Issuance and Financing Fees	0	0	0
Net Cash Provided by (Used in) Financing Activities	0	0	0
CCR | Non-Guarantor | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used In) Operating Activities	81,125	125,379	72,644
Cash Flows from Investing Activities:
Capital Expenditures	(37,177)	(31,143)	(19,496)
(Investments in), net of Distributions from, Subsidiaries	0	0
Proceeds from Sales of Assets	6	170	1,500
Other Investing Activity	0	0
Net Cash Used in Investing Activities	(37,171)	(30,973)	(17,996)
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations	(3,841)
Payments on Finance Lease Obligations		(3,052)	(96)
Affiliated Credit Facility	17,925	(33,583)	196,583
Net Payments on Revolver - MLP			(201,000)
Distributions to Noncontrolling Interest	(57,618)	(57,389)	(56,400)
Shares/Units Withheld for Taxes	(880)	(912)	(1,985)
Repurchases of Common Stock	0	0
Purchases of CCR Units	0	0	0
Spin Distribution to CNX Resources Corporation		0	0
Change in Parent Net Investment			0
Premium Paid on Extinguishment of Debt	0	0
Debt Issuance and Financing Fees	0	0	0
Net Cash Provided by (Used in) Financing Activities	(44,414)	(94,936)	(62,898)
Term Loan A
Cash Flows from Financing Activities:
Proceeds from debt	26,250	0	100,000
Payments on debt	(11,250)	(26,250)	0
Term Loan A | Elimination
Cash Flows from Financing Activities:
Proceeds from debt	0		0
Payments on debt	0	0
Term Loan A | Parent Issuer | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt	26,250		100,000
Payments on debt	(11,250)	(26,250)
Term Loan A | Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt	0		0
Payments on debt	0	0
Term Loan A | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt	0		0
Payments on debt	0	0
Term Loan A | CCR | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt	0		0
Payments on debt	0	0
Term Loan B
Cash Flows from Financing Activities:
Proceeds from debt	0	0	392,147
Payments on debt	(124,437)	(4,000)	0
Term Loan B | Elimination
Cash Flows from Financing Activities:
Proceeds from debt			0
Payments on debt	0	0
Term Loan B | Parent Issuer | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt			392,147
Payments on debt	(124,437)	(4,000)
Term Loan B | Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt			0
Payments on debt	0	0
Term Loan B | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt			0
Payments on debt	0	0
Term Loan B | CCR | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt			0
Payments on debt	0	0
Senior Secured Second Lien Notes due 2025
Cash Flows from Financing Activities:
Proceeds from debt	0	0	300,000
Payments on debt	(52,648)	(25,724)	0
Senior Secured Second Lien Notes due 2025 | Elimination
Cash Flows from Financing Activities:
Proceeds from debt			0
Payments on debt	0	0
Senior Secured Second Lien Notes due 2025 | Parent Issuer | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt			300,000
Payments on debt	(52,648)	(25,724)
Senior Secured Second Lien Notes due 2025 | Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt			0
Payments on debt	0	0
Senior Secured Second Lien Notes due 2025 | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt			0
Payments on debt	0	0
Senior Secured Second Lien Notes due 2025 | CCR | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt			0
Payments on debt	0	0
Other Asset-Backed Financing Arrangements
Cash Flows from Financing Activities:
Proceeds from debt	3,757	0	0
Payments on debt	(240)	$ 0	$ 0
Other Asset-Backed Financing Arrangements | Elimination
Cash Flows from Financing Activities:
Proceeds from debt	0
Payments on debt	0
Other Asset-Backed Financing Arrangements | Parent Issuer | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt	3,757
Payments on debt	(240)
Other Asset-Backed Financing Arrangements | Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt	0
Payments on debt	0
Other Asset-Backed Financing Arrangements | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt	0
Payments on debt	0
Other Asset-Backed Financing Arrangements | CCR | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Proceeds from debt	0
Payments on debt	$ 0