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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 6 Months Ended |  | 6 Months Ended | 1 Months Ended | 6 Months Ended |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Mar. 31, 2014 | Nov. 30, 2013 Sonatide joint venture | Sep. 30, 2014 Sonatide joint venture Vessel | Mar. 31, 2014 Sonatide joint venture | Sep. 30, 2014 Sonatide joint venture Dollars held by Sonatide that did not need to be converted to U.S dollars prior to payment to Tidewate | Sep. 30, 2014 Sonatide joint venture Sonatide's converting kwanzas into dollars and subsequent payment to Tidewater | Feb. 28, 2014 Sonatide joint venture United States of America, Dollars | Feb. 28, 2014 Sonatide joint venture Angola, Kwanza | Sep. 30, 2014 Sonatide joint venture ANGOLA Vessel | Sep. 30, 2013 Sonatide joint venture ANGOLA Vessel | Mar. 31, 2014 Sonatide joint venture Increase ANGOLA Vessel | Sep. 30, 2014 Sonatide joint venture Trade and other receivables | Mar. 31, 2014 Sonatide joint venture Trade and other receivables | Sep. 30, 2014 Sonatide joint venture Accrued expenses | Mar. 31, 2014 Sonatide joint venture Accrued expenses
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Definitive joint venture agreement term |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |
Due from related parties |  |  |  |  |  |  | $ 408,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Customer agreements that contain split currency |  |  |  |  |  |  |  |  |  |  | 70.00% | 30.00% |  |  |  |  |  |  |
Proceeds from related party |  |  |  |  |  |  | 186,000,000 |  | 104,000,000 | 82,000,000 |  |  |  |  |  |  |  |  |
Vessel revenues | 390,952,000 | 363,668,000 | 772,462,000 | 695,298,000 |  |  | 179,000,000 |  |  |  |  |  | 179,000,000 | 168,000,000 |  |  |  |  |
Percentage of Angolan operation revenue |  |  |  |  |  |  |  |  |  |  |  |  | 23.00% | 24.00% |  |  |  |  |
Number of vessels operating |  |  |  |  |  |  | 10 |  |  |  |  |  | 83 | 86 | 1 |  |  |  |
Number of vessels stacked |  |  |  |  |  |  | 4 |  |  |  |  |  | 5 | 11 |  |  |  |  |
Ownership Interest In Joint Venture |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |
Investments in, at equity, and advances to unconsolidated companies | 70,803,000 |  | 70,803,000 |  | 63,928,000 |  | 70,000,000 | 62,000,000 |  |  |  |  |  |  |  |  |  |  |
Due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 408,000,000 | 430,000,000 |  |
Due to related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 127,000,000 | 86,000,000
Commissions payable | $ 7,079,000 |  | $ 7,079,000 |  | $ 8,263,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,000,000 | $ 43,000,000
Ownership percentage requirement of local vessel operators |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Number of vessels transferred out of Angola |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Number of vessels stacked |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |

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