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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pay vs Performance Disclosure          
Pay vs Performance Disclosure, Table
Year
Summary Compensation Table (“SCT”) Total for PEOs ($)(1)
Compensation Actually Paid to PEOs ($)(2)
Average SCT Total for Non-PEO NEOs ($)(1)
Average Compensation Paid to Non-PEO NEOs ($)(2)
TSR ($)(3)
TSR Based on Fixed $100 Investment ($)(3)
20242,546,910 3,218,558 982,374 1,046,285 17.32 282.70 
20233,585,243 3,387,854 656,212 768,862 6.60 169.62 
20221,379,126 1,881,275 569,665 621,088 1.98 120.89 
20211,749,279 2,259,464 478,742 377,955 0.99 110.44 
        
Named Executive Officers, Footnote The PEOs were Justin C. Jacobs (2024), Stephen C. Taylor (2021 and Interim CEO for 2022, 2023 and 2024) and John Chisholm (Interim CEO for 2022) The NEOs were Brian L. Tucker and Ian M. Eckert for 2024, Brian L. Tucker and James R. Hazlett for 2023 and Micah C. Foster and James R. Hazlett for 2022 and 2021.        
PEO Total Compensation Amount $ 2,546,910 $ 3,585,243 $ 1,379,126 $ 1,749,279  
PEO Actually Paid Compensation Amount $ 3,218,558 3,387,854 1,881,275 2,259,464  
Adjustment To PEO Compensation, Footnote
Compensation Actually Paid to PEOs
YearPEO
SCT Total for PEOs ($)(1)
Exclusion of Equity Awards for PEOs ($)Inclusion of Equity Values for PEOs ($)Compensation Actually Paid to PEOs ($)
2024Justin C. Jacobs2,284,275 (1,225,274)1,856,114 2,915,115 
2024Stephen C. Taylor262,635 — 40,808 303,443 
2024Combined Total2,546,910 (1,225,274)1,896,922 3,218,558 
2023Stephen C. Taylor3,585,243 (200,000)2,611 3,387,854 
2022Stephen C. Taylor949,997 (313,545)815,694 1,452,146 
2022John Chisholm429,129 (59,635)59,635 429,129 
2022Combined Total1,379,126 (373,180)875,329 1,881,275 
2021Stephen C. Taylor1,749,279 (722,160)1,232,345 2,259,464 
(1)    As discussed elsewhere herein, $2,754,000 of compensation paid to Mr. Taylor relates to amounts paid in 2023 pursuant to his Retirement Agreement negotiated during 2022.
        
Non-PEO NEO Average Total Compensation Amount $ 982,374 656,212 569,665 478,742  
Non-PEO NEO Average Compensation Actually Paid Amount $ 1,046,285 768,862 621,088 377,955  
Adjustment to Non-PEO NEO Compensation Footnote
Compensation Actually Paid to NEOs
YearAverage Summary SCT for NEOs ($)Average Exclusion of Equity Awards for NEOs ($)Average Inclusion of Equity Values for NEOs ($)Average Compensation Actually Paid to NEOs ($)
2024982,374 (470,712)534,623 1,046,285 
2023656,212 (240,479)353,129 768,862 
2022569,665 (144,908)196,331 621,088 
2021478,742 (190,163)89,376 377,955 
        
Total Shareholder Return Amount $ 282.70 $ 169.62 $ 120.89 $ 110.44  
PEO Name Justin C. Jacobs Stephen C. Taylor John Chisholm Stephen C. Taylor  
Additional 402(v) Disclosure The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized or received by our NEOs. These amounts reflect the SCT Total with certain adjustments for stock-based compensation attributable to equity awards. The equity values are calculated in accordance with the FASB’s ASC Topic 718.Total Shareholder Return (“TSR”) for the years ended December 31, 2024, 2023, 2022 and 2021 is as follows:
TSR - (P1-P0) + D2024202320222021
P1 - Ending NGS stock price - December 31,$26.80 $16.08 $11.46 $10.47 
P0 = Initial stock price - January 1, 2021$9.48 $9.48 $9.48 $9.48 
D = Dividends$— $— $— $— 
TSR =$17.32 $6.60 $1.98 $0.99 
TSR/P0182.70 %69.62 %20.89 %10.44 %
TSR based on $100 investment$282.70 $169.62 $120.89 $110.44 
        
Equity Awards Adjustments, Footnote
YearPEOYear-End Fair Value ("FV") of Equity Awards Granted During the Year that Remained Unvested at the End of the Year ($)Change in FV From Last Day of Prior Year to Last Day of Current Year of Unvested Equity Awards ($)Change in FV From Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During the Year ($)Value of Dividends Paid on Equity Awards Not Otherwise Included ($)Total Inclusion of Equity Values ($)
2024Justin C. Jacobs1,856,114 — — — 1,856,114 
2024Stephen C. Taylor— — 40,808 — 40,808 
2024Combined Total1,856,114 — 40,808 — 1,896,922 
2023Stephen C. Taylor262,424 — (259,813)— 2,611 
2022Stephen C. Taylor697,215 103,144 15,335 — 815,694 
2022John Chisholm— — 59,635 — 59,635 
2022Combined Total697,215 103,144 74,970 — 875,329 
2021Stephen C. Taylor1,143,450 105,579 (16,684)— 1,232,345 
Total Inclusion of Equity Values for NEOs
YearYear-End Fair Value ("FV") of Equity Awards Granted During the Year that Remained Unvested at the End of the Year ($)Change in FV From Last Day of Prior Year to Last Day of Current Year of Unvested Equity Awards ($)Change in FV From Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During the Year ($)Value of Dividends Paid on Equity Awards Not Otherwise Included ($)Total Inclusion of Equity Values ($)
2024506,199 22,732 5,692 — 534,623 
2023364,342 — (11,213)— 353,129 
2022183,589 9,900 2,842 — 196,331 
2021130,875 6,601 (48,100)— 89,376 
        
Total Shareholder Return $ 17.32 $ 6.60 $ 1.98 $ 0.99  
Stock Price $ 26.80 $ 16.08 $ 11.46 $ 10.47 $ 9.48
Dividends Paid $ 0 $ 0 $ 0 $ 0  
Total Shareholder Return Percentage 182.70% 69.62% 20.89% 10.44%  
Justin C. Jacobs [Member]          
Pay vs Performance Disclosure          
PEO Total Compensation Amount $ 2,284,275        
PEO Actually Paid Compensation Amount 2,915,115        
Stephen C. Taylor [Member]          
Pay vs Performance Disclosure          
PEO Total Compensation Amount 262,635 $ 3,585,243 $ 949,997 $ 1,749,279  
PEO Actually Paid Compensation Amount 303,443 3,387,854 1,452,146 2,259,464  
John Chisholm [Member]          
Pay vs Performance Disclosure          
PEO Total Compensation Amount     429,129    
PEO Actually Paid Compensation Amount     429,129    
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (1,225,274)   (373,180)    
PEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 1,896,922   875,329    
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 1,856,114   697,215    
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0   103,144    
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 40,808   74,970    
PEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0   0    
PEO | Justin C. Jacobs [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (1,225,274)        
PEO | Justin C. Jacobs [Member] | Equity Awards Adjustments, Excluding Value Reported in Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 1,856,114        
PEO | Justin C. Jacobs [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 1,856,114        
PEO | Justin C. Jacobs [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
PEO | Justin C. Jacobs [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
PEO | Justin C. Jacobs [Member] | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
PEO | Stephen C. Taylor [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0 (200,000) (313,545) (722,160)  
PEO | Stephen C. Taylor [Member] | Equity Awards Adjustments, Excluding Value Reported in Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 40,808 2,611 815,694 1,232,345  
PEO | Stephen C. Taylor [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0 262,424 697,215 1,143,450  
PEO | Stephen C. Taylor [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0 0 103,144 105,579  
PEO | Stephen C. Taylor [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 40,808 (259,813) 15,335 (16,684)  
PEO | Stephen C. Taylor [Member] | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0 0 0 0  
PEO | John Chisholm [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount     (59,635)    
PEO | John Chisholm [Member] | Equity Awards Adjustments, Excluding Value Reported in Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount     59,635    
PEO | John Chisholm [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount     0    
PEO | John Chisholm [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount     0    
PEO | John Chisholm [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount     59,635    
PEO | John Chisholm [Member] | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount     0    
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (470,712) (240,479) (144,908) (190,163)  
Non-PEO NEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 534,623 353,129 196,331 89,376  
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 506,199 364,342 183,589 130,875  
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 22,732 0 9,900 6,601  
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 5,692 (11,213) 2,842 (48,100)  
Non-PEO NEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ 0 $ 0 $ 0 $ 0