v3.8.0.1

Vessel Sales and Vessel Acquisitions (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2016 USD ($) vessel | Oct. 31, 2016 USD ($) vessel | Aug. 31, 2016 USD ($) | Nov. 30, 2015 USD ($) vessel | Aug. 31, 2015 USD ($) vessel shares | Jan. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) vessel shares | May 31, 2014 USD ($) subsidiary | Oct. 31, 2015 USD ($) shares | Dec. 31, 2016 USD ($) vessel | Dec. 31, 2015 USD ($) vessel shares | Dec. 31, 2014 USD ($) subsidiary vessel | Mar. 31, 2015 vessel
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of vessels |  |  |  |  |  |  |  |  |  | $ (20,594) | $ 771 | $ 9,955 |
Aggregate proceeds received |  |  |  |  |  |  |  |  |  | 27,550 | 11,080 | 154,000 |
Revolving credit facilities repaid |  |  |  |  |  |  |  |  |  | 979,877 | 191,592 | 167,000 |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  | (20,600) |  |  |
Net proceeds from common stock |  |  |  |  |  |  |  |  |  | 7,558 | $ 246,032 | $ 111,190 |
Principal Maritime Tankers [Member] | Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  | 7,200,000 |  |  |  |  |  | 7,200,000 |  |
Number of common shares issued, non cash consideration |  |  |  |  | $ 49,300 |  |  |  |  |  | $ 49,300 |  |
Principal Maritime Tankers [Member] | Class A [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |
Suezmax Tankers [Member] | Principal Maritime Tankers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels, acquired | vessel |  |  |  |  | 12 |  |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  | 12 |  |  |  |  |  | 12 |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  | $ 661,300 |  |
Aggregate purchase price, cash |  |  |  |  |  |  |  |  |  |  | 612,000 |  |
Suezmax Tankers [Member] | Principal Maritime Tankers [Member] | Due January Twenty Nine Two Thousand Sixteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan facility, amount |  |  |  |  |  |  |  |  |  |  | $ 397,200 |  |
Suezmax Tankers [Member] | Principal Maritime Tankers [Member] | Class A [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  |  |  |  |  |  |  | 13,600,000 |  |
Net proceeds from common stock |  |  |  |  |  |  |  |  |  |  | $ 90,600 |  |
Aframax Tankers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  |  |  | 1 |  |  |  |  | 1 |
Aggregate purchase price |  |  |  |  |  |  | $ 37,000 |  |  |  |  | $ 37,000 |
Aframax Tankers [Member] | Other Non-current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow fund |  |  |  |  |  |  | $ 3,700 |  |  |  |  | $ 3,700 |
Modern LR2 vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  |  |  | 4 |  |  |  |  | 4 | 4
Aggregate purchase price |  |  |  |  |  |  | $ 193,300 |  |  |  |  | $ 193,300 |
Aframax Tanker And Lr Two Tankers [Member] | Due January Thirty Two Thousand Sixteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan facility, amount |  |  |  |  |  | $ 126,600 |  |  |  |  |  |  |
Tanker Investments Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate proceeds received |  |  |  |  |  |  |  | $ 154,000 |  |  |  |  |
Number of subsidiaries sold | subsidiary |  |  |  |  |  |  |  | 2 |  |  |  | 2 |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  |  |  | $ 10,000 |
Tanker Investments Ltd [Member] | Revolving Credit Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facilities repaid |  |  |  |  |  |  |  | $ 152,000 |  |  |  |  |
Tanker Investments Ltd [Member] | Working Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate proceeds received |  |  |  |  |  |  |  | 1,700 |  |  |  |  |
Tanker Investments Ltd [Member] | Vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate proceeds received |  |  |  |  |  |  |  | $ 154,000 |  |  |  |  |
MR Tanker 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate proceeds received |  |  | $ 14,000 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  | $ (6,600) |  |  |  |  |  |  |  |  |  |
MR Tanker 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of vessels | $ (8,100) |  |  |  |  |  |  |  |  |  |  |  |
Aggregate proceeds received | $ 13,200 |  |  |  |  |  |  |  |  |  |  |  |
Ship-to-ship Support Vessel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold | vessel | 2 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property, plant, and equipment | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets | $ 300 |  |  |  |  |  |  |  |  |  |  |  |
Suezmax Tankers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate proceeds received |  | $ 33,800 |  |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  | 2 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  | $ (6,200) |  |  |
Conventional Tankers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tankers sold | vessel |  |  |  | 1 |  |  |  |  |  |  |  |  |
Aggregate proceeds received |  |  |  | $ 11,200 |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  |  | $ 800 |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  | 13,630,075 | 3,000,000 | 24,166,666 |  | 7,180,083 |  |  |  |
Net proceeds from common stock |  |  |  |  | $ 90,640 | $ 13,685 | $ 111,190 |  | $ 49,268 |  |  |  |
MR Tanker 1 [Member] | Conventional Tankers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tankers sold | vessel | 1 |  |  |  |  |  |  |  |  |  |  |  |
MR Tanker [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tankers sold | vessel |  |  |  |  |  |  |  |  |  | 2 |  |  |
Suezmax Tankers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tankers sold | vessel |  |  |  |  |  |  |  |  |  | 2 |  |  |
Suezmax Tankers [Member] | Conventional Tankers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  | 2 |  |  |  |  |  |  |  | 2 |  |  |

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