v3.8.0.1

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) vessel | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) vessel | May 31, 2017 | Aug. 31, 2014
Significant Accounting Policies [Line Items] |  |  |  |  |
Ownership percentage | 100.00% |  |  |  |
Vessel's useful life | 25 years |  |  |  |
Depreciation of vessels and equipment excluding amortization of dry-docking expenditure | $ | $ 81.5 | $ 59.5 | $ 42.5 |  |
Minimum [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Ownership percentage | 11.30% |  |  |  |
Maximum [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |
High-Q Joint Venture [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of vessels | 1 |  |  |  |
Ownership percentage | 50.00% |  |  |  |
Charters In [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of vessels | 7 |  |  |  |
Company's Fleet [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of vessels | 51 |  |  |  |
Aframax Tankers [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of vessels |  |  | 1 |  |
Dry-Docking Activity [Member] | Minimum [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Vessel's useful life | 2 years 6 months |  |  |  |
Dry-Docking Activity [Member] | Maximum [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Vessel's useful life | 5 years |  |  |  |
IPO [Member] | Aframax Tankers [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of vessels | 9 |  |  |  |
Teekay Tanker Operations Ltd [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 50.00% |  | 50.00%
Subsequent Event [Member] | Teekay Tanker Operations Ltd [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 50.00% |
Teekay Corporation [Member] | Entities Under Common Control [Member] | Teekay Tanker Operations Ltd [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 50.00%
Teekay Corporation [Member] | Entities Under Common Control [Member] | Teekay Tanker Operations Ltd [Member] | Subsequent Event [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of assets, liabilities and results of business acquired |  |  |  | 100.00% |

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