Long-Term Debt - Additional Information - Other (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) credit_facility term_loan tranche	Dec. 31, 2017 USD ($) credit_facility term_loan
Debt Instrument [Line Items]
Debt instrument, face amount	$ 3,097,742	$ 3,123,728
Weighted-average interest rate	5.10%	4.10%
Aggregate principal repayments, 2019	$ 556,400
Aggregate principal repayments, 2020	349,000
Aggregate principal repayments, 2021	303,000
Aggregate principal repayments, 2022	596,300
Aggregate principal repayments, 2023	974,800
Aggregate principal repayments, thereafter	$ 362,700
Number of outstanding term loans \| term_loan	1	3
Revolving credit facility
Debt Instrument [Line Items]
Aggregate principal repayments, 2019	$ 148,100
Aggregate principal repayments, 2020	100,000
Aggregate principal repayments, 2021	100,000
Aggregate principal repayments, 2022	$ 175,000
Number of credit facilities \| credit_facility	2	3
Cross currency swap agreement
Debt Instrument [Line Items]
Fixed interest rate	7.45%
ALP Maritime Services B.V.
Debt Instrument [Line Items]
Debt instrument, face amount	$ 79,900
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%	3.75%
Collateralized debt obligations \| Revolving credit facility
Debt Instrument [Line Items]
Number of outstanding term loans \| credit_facility	1
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	122.00%
Collateralized debt obligations \| Maximum
Debt Instrument [Line Items]
Asset value to outstanding drawn principal balance ratio	125.00%
Vessel values to drawn principal balance ratios	414.00%

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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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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-Topic 470
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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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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