Transportation and Distribution Revenue - Additional Information (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 143 Months Ended | ||
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Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Oct. 31, 2030 |
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Concentration Risk [Line Items] | |||||
Remaining performance obligation | $ 60,800 | $ 60,800 | |||
Natural Gas Transportation Contract [Member] | Product and services [Member] | Revenue [Member] | |||||
Concentration Risk [Line Items] | |||||
Concentration percentage | 57.60% | 66.10% | 59.50% | 66.30% | |
Natural Gas Distribution Contract [Member] | Product and services [Member] | Revenue [Member] | |||||
Concentration Risk [Line Items] | |||||
Concentration percentage | 35.00% | 27.20% | 34.90% | 26.80% | |
Forecast [Member] | |||||
Concentration Risk [Line Items] | |||||
Recognized performance obligations quarterly | $ 138 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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