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Investments - Teekay Tankers - Ship-to-Ship Transfer Business - Additional Information (Detail) $ / shares in Units, $ in Thousands, shares in Millions |  | 1 Months Ended | 12 Months Ended
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Jul. 31, 2015 vessel $ / shares | Jul. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) shares
Net Investment Income [Line Items] |  |  |  |  |
Equity method investment, ownership interest |  |  | 100.00% |  |
Equity income |  |  | $ (37,344) | $ 85,639 | $ 102,871
Ship-to-Ship Transfer Business (SPT) | Teekay Tankers |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Purchase price of acquisition |  | $ 47,300 |  |  |
Number of vessels | vessel | 6 |  |  |  |
Equity method investment, ownership interest |  |  |  |  | 50.00%
Equity income |  |  |  |  | $ 8,700
Ship-to-Ship Transfer Business (SPT) | Teekay Tankers | Class B |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Number of common stock issued (in shares) | shares |  |  |  |  | 6.5
Ship-to-Ship Transfer Business (SPT) | Working Capital | Class B |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Number of common stock issued (in shares) | shares |  | 6.5 |  |  |
Ship-to-Ship Transfer Business (SPT) | Working Capital | Teekay Tankers |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Purchase price of acquisition |  | $ 1,800 |  |  |
Ship-to-Ship Transfer Business (SPT) | Working Capital | Teekay Tankers | Class B |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Shares issued, price per share | $ / shares | $ 6.99 | $ 6.99 |  |  |
Ship-to-Ship Transfer Business (SPT) | Aframax Tanker | Teekay Tankers |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Number of vessels | vessel | 1 |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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