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Long-Term Debt Narrative (Details) $ / shares in Units, € in Millions, shares in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
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Jan. 31, 2018 USD ($) | Jan. 27, 2010 USD ($) | Jul. 31, 2018 USD ($) | Nov. 30, 2015 USD ($) | Jun. 30, 2018 USD ($) vessel SecurityLoan term_loan $ / shares shares | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) subsidiary vessel SecurityLoan term_loan $ / shares shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) vessel | Dec. 31, 2014 USD ($) | Jun. 30, 2018 NOK (kr) vessel SecurityLoan term_loan shares | Jun. 30, 2018 EUR (€) vessel SecurityLoan term_loan shares | Jan. 26, 2018 USD ($) $ / shares | Dec. 31, 2017 EUR (€) vessel | May 31, 2015 NOK (kr)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of senior debt |  |  |  |  |  | $ 6,800,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 3,398,442,000 |  |  | $ 3,398,442,000 |  | $ 3,449,611,000 |  |  |  |  |  |
Long-term Debt |  |  |  |  | 3,349,333,000 |  |  | 3,349,333,000 |  | $ 3,417,705,000 |  |  |  |  |  |
Foreign exchange gain (loss) (notes 8 and 14) |  |  |  |  | $ 12,529,000 |  | $ (17,342,000) | $ 12,551,000 | $ (20,246,000) |  |  |  |  |  |  |
Weighted average interest rate, at point in time |  |  |  |  | 5.00% |  |  | 5.00% |  | 4.30% |  | 5.00% | 5.00% |  | 4.30% |
Remainder of fiscal year |  |  |  |  | $ 400,000,000 |  |  | $ 400,000,000 |  |  |  |  |  |  |  |
2019 |  |  |  |  | 300,000,000 |  |  | 300,000,000 |  |  |  |  |  |  |  |
2020 |  |  |  |  | 1,100,000,000 |  |  | 1,100,000,000 |  |  |  |  |  |  |  |
2021 |  |  |  |  | 800,000,000 |  |  | 800,000,000 |  |  |  |  |  |  |  |
2022 |  |  |  |  | 200,000,000 |  |  | 200,000,000 |  |  |  |  |  |  |  |
Thereafter |  |  |  |  | $ 600,000,000 |  |  | $ 600,000,000 |  |  |  |  |  |  |  |
Number of loan agreements | SecurityLoan |  |  |  |  | 7 |  |  | 7 |  |  |  | 7 | 7 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel market value to loan ratio |  |  |  |  | 126.00% |  |  | 126.00% |  |  |  | 126.00% | 126.00% |  |  |
Vessel market value to loan required ratio |  |  |  |  | 105.00% |  |  | 105.00% |  |  |  | 105.00% | 105.00% |  |  |
Undrawn revolving credit facilities time to maturity |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel market value to loan ratio |  |  |  |  | 183.00% |  |  | 183.00% |  |  |  | 183.00% | 183.00% |  |  |
Vessel market value to loan required ratio |  |  |  |  | 135.00% |  |  | 135.00% |  |  |  | 135.00% | 135.00% |  |  |
Term Loan One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum level of free cash maintained per loan agreements |  |  |  |  | $ 100,000,000 |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
Term Loan One | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Free liquidity and undrawn revolving credit line as percentage of debt |  |  |  |  | 7.50% |  |  | 7.50% |  |  |  | 7.50% | 7.50% |  |  |
Term Loan Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum level of free cash maintained per loan agreements |  |  |  |  | $ 50,000,000 |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Term Loan Two | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Free liquidity and undrawn revolving credit line as percentage of debt |  |  |  |  | 5.00% |  |  | 5.00% |  |  |  | 5.00% | 5.00% |  |  |
Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum level of free cash maintained per loan agreements |  |  |  |  | $ 50,000,000 |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Revolving Credit Facilities | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Free liquidity and undrawn revolving credit line as percentage of debt |  |  |  |  | 5.00% |  |  | 5.00% |  |  |  | 5.00% | 5.00% |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 1,400,000,000 |  |  | $ 1,400,000,000 |  | $ 1,400,000,000 |  |  |  |  |  |
Number of debt instruments | term_loan |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |
Number of debt instruments with balloon or bullet payments | term_loan |  |  |  |  | 9 |  |  | 9 |  |  |  | 9 | 9 |  |  |
Number of vessels held as collateral | vessel |  |  |  |  | 26 |  |  | 26 |  | 22 |  | 26 | 26 |  | 22 |
Secured Debt | Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments | term_loan |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Secured Debt | Remaining Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 5.37% |  |  | 5.37% |  |  |  | 5.37% | 5.37% |  |  |
Secured Debt | Remaining Term Loans | Fixed Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments | term_loan |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Secured Debt | Remaining Term Loans | Three Month London Interbank Offered Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum variable interest rate on debt |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |
Secured Debt | Remaining Term Loans | Three Month London Interbank Offered Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum variable interest rate on debt |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |
Senior Notes (8.5%) due January 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, percentage rate |  | 8.50% |  | 8.50% | 8.50% | 8.50% |  | 8.50% |  |  |  | 8.50% | 8.50% |  |  |
Debt instrument, principal amount |  | $ 450,000,000 |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of par at which notes sold |  | 99.20% |  | 99.01% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  |  | 8.67% |  |  | 8.67% |  |  |  | 8.67% | 8.67% |  |  |
Repayments of senior debt |  |  |  |  |  |  |  |  |  |  | $ 57,300,000 |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Discount rate for redemption feature |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 585,841,000 |  |  | $ 585,841,000 |  | $ 592,657,000 |  |  |  |  |  |
Convertible Debt | Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.70 |  |
Initial conversion price premium | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.75 |  |
Norwegian Kroner Denominated Bonds Due Through October 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | 380,491,000 |  |  | 380,491,000 |  | 377,856,000 |  |  |  |  |  |
Euro-denominated Term Loans due through 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 217,621,000 |  |  | $ 217,621,000 |  | 232,957,000 |  |  |  |  |  |
Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of credit facilities | term_loan |  |  |  |  | 7 |  |  | 7 |  |  |  | 7 | 7 |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | $ 1,194,827,883.76 |  |  | $ 1,194,827,883.76 |  |  |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  | 500,000,000 |  |  | 500,000,000 |  |  |  |  |  |  |  |
Line of Credit, reduction of available borrowing capacity, remainder of fiscal year |  |  |  |  | 480,300,000 |  |  | 480,300,000 |  |  |  |  |  |  |  |
Line of Credit, reduction of available borrowing capacity, year two |  |  |  |  | 52,600,000 |  |  | 52,600,000 |  |  |  |  |  |  |  |
Line of Credit, reduction of available borrowing capacity, year three |  |  |  |  | 53,600,000 |  |  | 53,600,000 |  |  |  |  |  |  |  |
Line of Credit, reduction of available borrowing capacity, year four |  |  |  |  | 347,300,000 |  |  | 347,300,000 |  |  |  |  |  |  |  |
Line of Credit, reduction of available borrowing capacity, thereafter |  |  |  |  | $ 261,000,000 |  |  | $ 261,000,000 |  |  |  |  |  |  |  |
Debt instrument, collateral, number of vessels | vessel |  |  |  |  | 50 |  |  | 50 |  |  |  | 50 | 50 |  |  |
Long-term debt, gross |  |  |  |  | $ 679,141,000 |  |  | $ 679,141,000 |  | $ 877,343,000 |  |  |  |  |  |
Revolving Credit Facilities | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum variable interest rate on debt |  |  |  |  |  |  |  | 1.25% |  | 0.45% |  |  |  |  |  |
Revolving Credit Facilities | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum variable interest rate on debt |  |  |  |  |  |  |  | 4.00% |  | 4.00% |  |  |  |  |  |
Revolving Credit Facilities | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | 200,000,000 |  |  | $ 200,000,000 |  |  |  |  |  |  |  |
Teekay Offshore | Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |
Teekay LNG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum level of free cash maintained per loan agreements |  |  |  |  | 35,000,000.0 |  |  | 35,000,000.0 |  |  |  |  |  |  |  |
Teekay LNG | Norwegian Kroner Denominated Bonds Due Through October 2021 | Nibor Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 3,100,000,000
Unsecured debt | kr |  |  |  |  |  |  |  |  |  |  |  | kr 3,100,000,000 |  |  |  |
Senior notes |  |  |  |  | 380,500,000 |  |  | 380,500,000 |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 430,500,000 |  |  | $ 430,500,000 |  |  |  |  |  |  |  |
Teekay LNG | Norwegian Kroner Denominated Bonds Due Through October 2021 | Nibor Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum variable interest rate on debt |  |  |  |  |  |  |  | 3.70% |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  | 5.92% |  |  | 5.92% |  |  |  | 5.92% | 5.92% |  |  |
Teekay LNG | Norwegian Kroner Denominated Bonds Due Through October 2021 | Nibor Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum variable interest rate on debt |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  | 7.72% |  |  | 7.72% |  |  |  | 7.72% | 7.72% |  |  |
Teekay LNG | Euro-denominated Term Loans due through 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments | term_loan |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Number of vessels held as collateral | vessel |  |  |  |  | 2 |  |  | 2 |  |  |  | 2 | 2 |  |  |
Long-term Debt |  |  |  |  | $ 217,600,000 |  |  | $ 217,600,000 |  | $ 233,000,000 |  |  | € 186.2 |  | € 194.1 |
Number of subsidiaries | subsidiary |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Teekay LNG | Euro-denominated Term Loans due through 2023 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum variable interest rate on debt |  |  |  |  |  |  |  | 0.60% |  |  |  |  |  |  |  |
Teekay LNG | Euro-denominated Term Loans due through 2023 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum variable interest rate on debt |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |
Teekay Tankers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum level of free cash maintained per loan agreements |  |  |  |  | $ 35,000,000 |  |  | $ 35,000,000 |  |  |  |  |  |  |  |
Teekay Tankers | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Free liquidity and undrawn revolving credit line as percentage of debt |  |  |  |  | 5.00% |  |  | 5.00% |  |  |  | 5.00% | 5.00% |  |  |
Teekay Tankers | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt guaranteed |  |  |  |  | $ 226,800,000 |  |  | $ 226,800,000 |  |  |  |  |  |  |  |
Securities Pledged as Collateral | Teekay Offshore | Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common unit, issued | shares |  |  |  |  | 38.2 |  |  | 38.2 |  |  |  | 38.2 | 38.2 |  |  |
Securities Pledged as Collateral | Teekay LNG | Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common unit, issued | shares |  |  |  |  | 25.2 |  |  | 25.2 |  |  |  | 25.2 | 25.2 |  |  |
Class A common stock | Securities Pledged as Collateral | Teekay Tankers | Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common unit, issued | shares |  |  |  |  | 16.8 |  |  | 16.8 |  |  |  | 16.8 | 16.8 |  |  |
Common Stock | Convertible Debt | Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per share (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.055 |  |
Teekay Parent | Convertible Debt | Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Proceeds from convertible debt | $ 104,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, carrying amount of equity component |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,100,000 |  |
Teekay Parent | Teekay Offshore | Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |
Teekay Parent | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in USD per share) | $ / shares |  |  |  |  | $ 9.75 |  |  | $ 9.75 |  |  |  |  |  |  |  |
Subsequent Event | Senior Notes (8.5%) due January 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, percentage rate |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of senior debt |  |  | $ 45,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The discount rate used to calculate the present value of the long-term debt to determine the redemption amount. + References No definition available. + Details
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