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Members Equity - Additional Information (Detail) - USD ($) |  |  |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 26, 2019 | Nov. 30, 2018 | Nov. 29, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 17, 2018 | Feb. 28, 2017 | Feb. 11, 2013
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Membership units issued |  |  |  |  |  |  |  |  |  | 1,000
Membership units issued, par value |  |  |  |  |  |  |  |  |  | $ 1
Membership units issued, capital contribution value |  |  |  |  |  |  |  |  |  | $ 1,000
Minority interest |  |  |  | $ 1,530,000 |  | $ 1,323,000 | $ 1,365,000 |  |  |
Notes receivable due from chief operating officer, settled |  |  |  | $ 708,000 | $ (1,483,000) | 1,145,000 | $ (1,054,000) |  |  |
Members contribution, units |  | 1,000 |  |  |  |  |  |  |  |
Members contribution, value |  |  |  |  |  | $ 48,743,000 |  |  |  |
Convertible debt, exchanged |  | $ 48,700,000 |  |  |  |  |  |  |  |
American Electric Technologies Inc [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of outstanding units exchanged |  |  |  |  |  |  |  | 100.00% |  |
Capital Unit, Class B [Member] | LNG Investments [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Members contribution, units |  | 2,000 |  |  |  |  |  |  |  |
Members contribution, value |  | $ 20,000,000 |  |  |  |  |  |  |  |
Capital Unit, Class A [Member] | LNG Investments [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate number of common units issued in exchange for indebtedness |  | $ 4,874.28 |  |  |  |  |  |  |  |
JCH Crenshaw Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Members contribution, units |  | 500 |  |  |  |  |  |  |  |
Members contribution, value |  | $ 10,000,000 |  |  |  |  |  |  |  |
JCH Crenshaw Holdings LLC [Member] | Capital Unit, Class B [Member] | LNG Investments [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Members contribution, units |  | 1,000 |  |  |  |  |  |  |  |
Members contribution, value |  | $ 10,000,000 |  |  |  |  |  |  |  |
Crenshaw Family Holdings LP [member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Members contribution, units |  | 500 |  |  |  |  |  |  |  |
Members contribution, value |  | $ 10,000,000 |  |  |  |  |  |  |  |
Crenshaw Family Holdings LP [member] | Capital Unit, Class B [Member] | LNG Investments [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Members contribution, units |  | 1,000 |  |  |  |  |  |  |  |
Members contribution, value |  | $ 10,000,000 |  |  |  |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Notes receivable due from chief operating officer, settled |  |  | $ (500,000) |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Units authorized |  |  |  |  |  |  |  |  |  | 1,000
Subsequent Event [Member] | Share Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination share exchange resultant description | $ 0 |  |  |  |  |  |  |  |  |
Number of common stock issued under share exchange agreement | 105,558,606 |  |  |  |  |  |  |  |  |
Percentage of number of common stock issued and outstanding under share exchange agreement | 90.00% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Parent Company [Member] | Share Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest acquired | 100.00% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Board of Directors Chairman [Member] | Share Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of beneficial ownership | 88.40% |  |  |  |  |  |  |  |  |
PEG Partners LLC [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  |  |  |  | 80.00% |
Minority interest |  |  |  |  |  |  |  |  | $ 1,600,000 |
Minority interest percentage |  |  |  |  |  |  |  |  | 20.00% |
PEG Partners LLC [Member] | Subsequent Event [Member] | Share Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of outstanding limited liability owned | 80.00% |  |  |  |  |  |  |  |  |
PEG Partners LLC [Member] | Subsequent Event [Member] | Parent Company [Member] | Share Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest acquired | 20.00% |  |  |  |  |  |  |  |  |
Percentage of outstanding limited liability owned | 100.00% |  |  |  |  |  |  |  |  |
American Electric Technologies Inc [Member] | Subsequent Event [Member] | Parent Company [Member] | Share Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |
Members Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of outstanding limited liability owned | 100.00% |  |  |  |  |  |  |  |  |

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