Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Thousands				1 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($) $ / shares	Oct. 31, 2017 USD ($)	Jul. 31, 2017 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2018 director $ / shares	Dec. 31, 2017 USD ($)
Temporary Equity
Proceeds from the issuance of preferred stock						$ 435,000
June 30, 2018 Anniversary
Temporary Equity
Conversion of stock, conversion price \| $ / shares					$ 13.90
Redeemable Convertible Preferred Stock
Temporary Equity
Quarterly dividend, amount	$ 6,656	$ 6,558
Dividend, record date	Jan. 15, 2018	Oct. 15, 2017
Dividend, date paid	Jan. 31, 2018	Oct. 31, 2017
Beneficial conversion feature	$ 1,900
Redeemable Convertible Preferred Stock \| Dividend Payment In Kind
Temporary Equity
Preferred equity, initial accreted value, per share \| $ / shares			$ 1,000
Quarterly dividend announced date			Jul. 31, 2017
Quarterly dividend, amount			$ 2,175
Dividend, record date			Jul. 15, 2017
Preferred Stock Purchase Agreement \| 10% Ownership of Outstanding Common Stock
Temporary Equity
Number of directors entitled to be elected upon holding of outstanding common stock \| director					2
Preferred Stock Purchase Agreement \| Carlyle \| 5% Ownership of Outstanding Common Stock
Temporary Equity
Number of directors entitled to be elected upon holding of outstanding common stock \| director					1
Preferred Stock Purchase Agreement \| Minimum \| Carlyle \| 10% Ownership of Outstanding Common Stock
Temporary Equity
Holding percentage of outstanding common stock to elect director					10.00%
Preferred Stock Purchase Agreement \| Minimum \| Carlyle \| 5% Ownership of Outstanding Common Stock
Temporary Equity
Holding percentage of outstanding common stock to elect director					5.00%
Preferred Stock Purchase Agreement \| Redeemable Convertible Preferred Stock
Temporary Equity
Proceeds from the issuance of preferred stock				$ 435,000
Preferred stock, shares issued \| shares				435,000
Preferred equity, initial accreted value, per share \| $ / shares	$ 1,024			$ 1,000
Preferred stock, dividend rate percentage					6.00%
Preferred stock redemption date					Jun. 30, 2022
Preferred Stock Purchase Agreement \| Redeemable Convertible Preferred Stock \| December 30, 2019 Anniversary
Temporary Equity
Percentage of preferred stock conversion price					130.00%
Number of trading days required for conversion					25 days
Preferred Stock Purchase Agreement \| Redeemable Convertible Preferred Stock \| June 30, 2021 Anniversary
Temporary Equity
Percentage of preferred stock conversion price					140.00%
Number of trading days required for conversion					25 days
Preferred Stock Purchase Agreement \| Redeemable Convertible Preferred Stock \| June 30, 2023 Anniversary
Temporary Equity
Multiple percentage on preferred stock accreted value					112.00%
Preferred Stock Purchase Agreement \| Redeemable Convertible Preferred Stock \| June 30, 2024 Anniversary
Temporary Equity
Multiple percentage on preferred stock accreted value					109.00%
Preferred Stock Purchase Agreement \| Redeemable Convertible Preferred Stock \| After June 30, 2024 Anniversary
Temporary Equity
Multiple percentage on preferred stock accreted value					106.00%

Brazos Valley Longhorn, L.L.C. 10-K