Long-Term Debt - Additional Information - Other (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) term_loan credit_facility tranche	Dec. 31, 2018 USD ($) term_loan credit_facility
Debt Instrument [Line Items]
Debt instrument, face amount	$ 3,178,950	$ 3,097,742
Weighted-average interest rate	4.30%	5.10%
Aggregate principal repayments, 2020	$ 354,400
Aggregate principal repayments, 2021	315,700
Aggregate principal repayments, 2022	577,700
Aggregate principal repayments, 2023	1,113,300
Aggregate principal repayments, 2024	453,200
Aggregate principal repayments, thereafter	$ 414,400
Number of outstanding term loans \| term_loan	1	1
Revolving credit facility
Debt Instrument [Line Items]
Aggregate principal repayments, 2020	$ 73,600
Aggregate principal repayments, 2021	73,600
Aggregate principal repayments, 2022	103,600
Aggregate principal repayments, 2023	53,600
Aggregate principal repayments, 2024	$ 208,800
Number of credit facilities \| credit_facility	2	2
ALP Maritime Services B.V.
Debt Instrument [Line Items]
Debt instrument, face amount	$ 71,600
Number of tranches \| tranche	1
Fixed interest rate	2.93%
Interest rate swaps \| LIBOR \| Minimum
Debt Instrument [Line Items]
Marginal rate added for interest paid (as a percent)	0.90%	0.90%
Interest rate swaps \| LIBOR \| Maximum
Debt Instrument [Line Items]
Marginal rate added for interest paid (as a percent)	4.30%	4.30%
Collateralized Debt Obligations \| Revolving credit facility
Debt Instrument [Line Items]
Number of outstanding term loans \| credit_facility	2
Collateralized Debt Obligations \| Term loan
Debt Instrument [Line Items]
Number of outstanding term loans \| credit_facility	7
Collateralized Debt Obligations \| Minimum
Debt Instrument [Line Items]
Asset value to outstanding drawn principal balance ratio	100.00%
Vessel values to drawn principal balance ratios	126.00%
Collateralized Debt Obligations \| Maximum
Debt Instrument [Line Items]
Asset value to outstanding drawn principal balance ratio	150.00%
Vessel values to drawn principal balance ratios	501.00%

Number Of Credit Facilities

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Number of debt instruments.

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Number Of Tranches

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Vessel Market Value To Loan Ratio

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Vessel Market Value to Loan Required Ratio

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Fixed interest rate related to the interest rate derivative.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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