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Investment in Unconsolidated Companies - Additional Information (Detail) | 3 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) Vessel Kz / $ | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Vessel Kz / $ | Jul. 31, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) Vessel Kz / $ | Dec. 31, 2017 USD ($) Vessel Kz / $ | Dec. 31, 2018 USD ($) Vessel Kz / $ | Mar. 31, 2017 USD ($) Vessel
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fresh-start adjustment equity method investment | [1] |  |  |  |  |  | $ (24,683,000) |  |  |  |  |  |
Fresh-start adjustment, period |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Due from affiliate |  | $ 132,951,000 |  |  |  | $ 230,315,000 |  | $ 230,315,000 |  | $ 230,315,000 | $ 132,951,000 |  |
Impairments Charges |  | 36,878,000 | $ 16,853,000 | $ 1,215,000 | $ 6,186,000 | 16,777,000 |  | 16,777,000 | [2] |  | 61,132,000 | [2] |
Due to affiliate |  | 34,972,000 |  |  |  | 99,448,000 |  | 99,448,000 |  | 99,448,000 | 34,972,000 |  |
Commissions payable | [3] | $ 1,990,000 |  |  |  | $ 1,898,000 |  | $ 1,898,000 |  | $ 1,898,000 | $ 1,990,000 |  |
Number of vessels operating | Vessel |  | 257 |  |  |  | 227 |  | 227 |  | 227 | 257 |  |
Total revenues |  |  |  |  |  |  |  | $ 178,753,000 |  |  | $ 406,520,000 |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 1,039,000 |  |  |  | $ 29,216,000 |  | 29,216,000 |  | $ 29,216,000 | 1,039,000 |  |
DTDW Holdings, Ltd. | NIGERIA |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Due from related party |  | 23,775,000 |  |  |  | 33,353,000 |  | 33,353,000 |  | 33,353,000 | 23,775,000 |  |
Due to related party |  | $ 5,625,000 |  |  |  | 9,645,000 |  | 9,645,000 |  | 9,645,000 | $ 5,625,000 |  |
Trade and Other Receivables, Net | DTDW Holdings, Ltd. | NIGERIA |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Due from related party |  |  |  |  |  | 33,400,000 |  | 33,400,000 |  | 33,400,000 |  |  |
Accounts Payable | DTDW Holdings, Ltd. | NIGERIA |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Due to related party |  |  |  |  |  | $ 9,600,000 |  | $ 9,600,000 |  | $ 9,600,000 |  |  |
Sonatide Marine, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in unconsolidated affiliates |  | 49.00% |  |  |  | 49.00% |  | 49.00% |  | 49.00% | 49.00% |  |
Fresh-start adjustment equity method investment |  | $ 27,700,000 |  |  |  |  |  |  |  |  | $ 27,700,000 |  |
Due from affiliate |  | 109,176,000 |  |  |  | $ 230,315,000 | 252,393,000 | $ 230,315,000 |  | $ 230,315,000 | 109,176,000 |  |
Due from affiliate current net after offsetting due to affiliate and before Impairment |  | 100,000,000 |  |  |  |  |  |  |  |  | 100,000,000 |  |
Cash |  | 58,000,000 |  |  |  |  |  |  |  |  | 58,000,000 |  |
Working capital to satisfy net due from affiliate |  | 75,000,000 |  |  |  |  |  |  |  |  | 75,000,000 |  |
Impairments Charges |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 |  |
Percentage of devaluation of currency |  |  |  |  |  |  |  |  |  |  | 84.00% |  |
Due to affiliate |  | 29,347,000 |  |  |  | 99,448,000 | $ 123,899,000 | 99,448,000 |  | 99,448,000 | $ 29,347,000 |  |
Commissions payable |  | $ 28,000,000 |  |  |  |  |  |  |  |  | $ 28,000,000 |  |
Number of vessels operating | Vessel |  | 4 |  |  |  |  |  |  |  |  | 4 |  |
Number of vessels stacked | Vessel |  | 2 |  |  |  |  |  |  |  |  | 2 |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 0 |  |  |  | $ 27,000,000 |  | $ 27,000,000 |  | $ 27,000,000 | $ 0 |  |
Sonatide Marine, Ltd. | Angola, Kwanza |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ 20,000,000 |  |  |  |  |  |  |  |  | $ 20,000,000 |  |
Foreign currency exchange rate | Kz / $ |  | 309 |  |  |  | 168 |  | 168 |  | 168 | 309 |  |
Sonatide Marine, Ltd. | Trade Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net trade accounts receivable |  | $ 23,000,000 |  |  |  |  |  |  |  |  | $ 23,000,000 |  |
Sonatide Marine, Ltd. | ANGOLA |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels operating | Vessel |  | 37 |  |  |  | 43 | 50 | 43 |  | 43 | 37 |  | 58
Number of vessels stacked | Vessel |  | 16 |  |  |  | 16 | 21 | 16 |  | 16 | 16 |  | 20
Total revenues |  |  |  |  |  |  | $ 34,000,000 |  |  | $ 34,000,000 | $ 59,000,000 |  | $ 127,000,000
Percentage of Angolan operation revenue |  |  |  |  |  |  | 23.00% |  |  | 20.00% | 15.00% |  | 22.00%
DTDW Holdings, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in unconsolidated affiliates |  | 40.00% |  |  |  |  |  |  |  |  | 40.00% |  |
Fresh-start adjustment equity method investment |  | $ 4,200,000 |  |  |  |  |  |  |  |  | $ 4,200,000 |  |
Sonatide |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions payable |  | 28,000,000 |  |  |  | $ 36,400,000 |  | $ 36,400,000 |  | $ 36,400,000 | 28,000,000 |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 0 |  |  |  |  |  |  |  |  | 0 |  |
Dividend received |  |  |  |  |  |  |  |  |  |  | $ 12,000,000 |  |
Maximum | Sonatide Marine Ltd and DTDW Holdings Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in unconsolidated affiliates |  | 50.00% |  |  |  |  |  |  |  |  | 50.00% |  |
[1] | Reflects the adjustment to decrease the carrying value of our equity method investments to their estimated fair values which were determined using a discounted cash flow analysis.
[2] | The twelve months ended December 31, 2018, the period August 1, 2017 through December 31, 2017 and the twelve months ended March 31, 2017 included $3.5 million, $2.3 million and $2.2 million respectively, of impairments related to inventory and other non-vessel assets. There were no impairments to non-vessel assets during the period April 1, 2017 through July 31, 2017.
[3] | Excludes $28.0 million and $36.4 million of commissions due to Sonatide at December 31, 2018 and 2017, respectively. These amounts are included in amounts due to affiliates.

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