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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) Contract | Mar. 31, 2015 USD ($) Contract
Derivatives, Fair Value [Line Items] |  |
Cash equivalents maturity period, days | 90 days |
Number of contracts outstanding | Contract | 0 | 2
Notional value of foreign exchange contract |  | $ 2,300,000
Change in Gain/(loss) on asset dispositions | $ 10,600,000 |
Deferred gains on sale/leaseback transactions | 5,800,000 |
Net gains from the sale of vessels and other assets | 1,500,000 |
Fast, Crew/Supply Boat |  |
Derivatives, Fair Value [Line Items] |  |
Impairment charge on amounts not recoverable | 2,400,000 |
Stacked Vessels and Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Impairment charge on amounts not recoverable | 11,700,000 |
Vessels Under Construction |  |
Derivatives, Fair Value [Line Items] |  |
Impairment charge on amounts not recoverable | 800,000 |
Forward Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | $ 0 | $ 0

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