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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) $ in Thousands | 1 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Due from affiliate |  |  | $ 230,315 |
Due to affiliate |  |  | 99,448 |
Commissions payable |  |  | 1,898 |
Total revenues |  |  | 178,753 |
Investments in, at equity, and advances to unconsolidated companies |  |  | 29,216 |
Sonatide joint venture |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Due from affiliate |  |  | 230,000 | $ 263,000
Unpaid vessel revenue |  |  | 44,000 |
Due to affiliate |  |  | 99,000 | 133,000
Commissions payable |  |  | 36,400 |
Due from affiliate and due to affiliate |  |  | $ 33,000 |
Ownership Interest In Joint Venture |  |  | 49.00% |
Investments in, at equity, and advances to unconsolidated companies |  |  | $ 27,000 | 45,000
Investment balance in difference between carrying value and net assets of the joint venture | $ 28,000 | $ 28,000 |  |
Amortization period of basis difference equity method investments | 10 years |  |  |
Sonatide joint venture | U.S. dollars initially received by Sonatide on behalf of the company or dollars collected from other customers |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Proceeds from related party |  | 19,000 | 20,000 |
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Proceeds from related party |  | 3,000 | 1,000 |
Sonatide joint venture | ANGOLA |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Proceeds from related party |  | 22,000 | 21,000 |
Total revenues |  | $ 34,000 | $ 34,000 | $ 127,000
Percentage of Angolan operation revenue |  | 23.00% | 20.00% | 22.00%
"Number of vessels transferred out of Angola | Vessel" |  | 3 | 3 | 22
Sonatide joint venture | Angolan kwanza-denominated |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |
Bank deposits maintained |  |  | $ 81,000 |

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