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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($) Vessel	Dec. 31, 2015 USD ($) Vessel	Dec. 31, 2016 USD ($) Vessel	Dec. 31, 2015 USD ($) Vessel	Mar. 31, 2016 USD ($) Vessel
Commitments and Contingencies Disclosure [Line Items]
Due from affiliate	$ 287,592		$ 287,592		$ 338,595
Due to affiliate	132,836		132,836		187,971
Vessel revenues	125,120	$ 212,908	426,911	$ 775,352
Investments in, at equity, and advances to unconsolidated companies	42,516		42,516		37,502
Sonatide joint venture
Commitments and Contingencies Disclosure [Line Items]
Due from affiliate	288,000		288,000		339,000
Unpaid vessel revenue	112,000		112,000
Due from affiliate and due to affiliate			69,000
Due to affiliate	$ 133,000		$ 133,000		188,000
Number of vessels operating | Vessel	7		7
Number of vessels stacked | Vessel	3		3
Ownership Interest In Joint Venture	49.00%		49.00%
Investments in, at equity, and advances to unconsolidated companies	$ 43,000		$ 43,000		$ 37,000
Percentage of tax valued on all debit transactions			0.10%
Debit transactions tax revoked effective date			Jan. 01, 2017
Sonatide joint venture | ANGOLA
Commitments and Contingencies Disclosure [Line Items]
Proceeds from related party			$ 80,000
Vessel revenues			$ 101,000	$ 172,000
Percentage of Angolan operation revenue			24.00%	22.00%
Number of vessels operating | Vessel	59	66	59	66
Number of vessels stacked | Vessel	19	8	19	8
Number of vessels transferred out of Angola | Vessel			18		23
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			$ 73,000
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company
Commitments and Contingencies Disclosure [Line Items]
Proceeds from related party			7,000
Sonatide joint venture | Angolan kwanza-denominated
Commitments and Contingencies Disclosure [Line Items]
Bank deposits maintained	$ 86,000		$ 86,000

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