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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) (USD $) | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 3 Months Ended | 1 Months Ended | 3 Months Ended |  |  |  |
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Jun. 30, 2014 | Jun. 30, 2013 | Mar. 31, 2014 | Nov. 30, 2013 Sonatide joint venture | Jun. 30, 2014 Sonatide joint venture Vessel | Mar. 31, 2014 Sonatide joint venture | Jun. 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 | Jun. 30, 2014 Sonatide joint venture Sonatide's conversion of kwanzas to 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 | Jun. 30, 2014 Sonatide joint venture ANGOLA Vessel | Jun. 30, 2013 Sonatide joint venture ANGOLA Vessel | Jun. 30, 2014 Sonatide joint venture Increase ANGOLA Vessel | Jun. 30, 2014 Sonatide joint venture Trade and other receivables | Mar. 31, 2014 Sonatide joint venture Trade and other receivables | Jun. 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 |  |  |  |  | $ 430,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Customer agreements that contain split currency |  |  |  |  |  |  |  |  | 70.00% | 30.00% |  |  |  |  |  |  |
Proceeds from related party |  |  |  |  | 91,000,000 |  | 59,000,000 | 32,000,000 |  |  |  |  |  |  |  |  |
Vessel revenues | 381,510,000 | 331,630,000 |  |  | 87,000,000 |  |  |  |  |  | 87,000,000 | 98,000,000 |  |  |  |  |
Percentage of Angolan operation revenue |  |  |  |  |  |  |  |  |  |  | 23.00% | 29.00% |  |  |  |  |
Number of vessels operating |  |  |  |  | 10 |  |  |  |  |  | 83 | 88 | 1 |  |  |  |
Number of vessels stacked |  |  |  |  |  |  |  |  |  |  | 4 | 5 |  |  |  |  |
Ownership Interest In Joint Venture |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |
Investments in, at equity, and advances to unconsolidated companies | 67,926,000 |  | 63,928,000 |  | 66,000,000 | 62,000,000 |  |  |  |  |  |  |  |  |  |  |
Due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |  | 430,000,000 | 430,000,000 |  |
Due to related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 118,000,000 | 86,000,000
Commissions payable | $ 6,785,000 |  | $ 8,263,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,000,000 | $ 43,000,000

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