Long-Term Debt - Additional Information - Other (Details) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2018 USD ($) credit_facility term_loan	Dec. 31, 2017 USD ($) credit_facility term_loan
Debt Instrument [Line Items]
Carrying amount of debt	$ 2,966,208	$ 3,123,728
Weighted-average effective interest rate	4.70%	4.10%
Aggregate principal repayments, remainder of 2018	$ 254,700
Aggregate principal repayments, 2019	537,300
Aggregate principal repayments, 2020	349,000
Aggregate principal repayments, 2021	303,000
Aggregate principal repayments, 2022	596,300
Aggregate principal repayments, thereafter	$ 974,300
Number Of Debt Instruments \| term_loan	2	2
Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal repayments, remainder of 2018	$ 75,600
Aggregate principal repayments, 2019	148,200
Aggregate principal repayments, 2020	100,000
Aggregate principal repayments, 2021	100,000
Aggregate principal repayments, 2022	$ 175,000
Number Of Debt Instruments \| term_loan	1
Number of credit facilities \| credit_facility	2	3
Term Loan
Debt Instrument [Line Items]
Number Of Debt Instruments \| term_loan	7
Minimum \| Collateralized Debt Obligations
Debt Instrument [Line Items]
Asset value to outstanding drawn principal balance ratio	100.00%
Vessel values to drawn principal balance ratios	119.65%
Maximum \| Collateralized Debt Obligations
Debt Instrument [Line Items]
Asset value to outstanding drawn principal balance ratio	125.00%
Vessel values to drawn principal balance ratios	273.33%
Interest Rate Swap \| Minimum
Debt Instrument [Line Items]
Range of credit facility margin (as a percent)	0.90%	0.90%
Interest Rate Swap \| Maximum
Debt Instrument [Line Items]
Range of credit facility margin (as a percent)	4.30%	3.75%
ALP Maritime Services B.V.
Debt Instrument [Line Items]
Carrying amount of debt	$ 84,100
Fixed interest rate	2.93%

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Vessel Market Value To Loan Ratio

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The percentage points added to the reference rate to compute the variable rate on 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
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-Section S99
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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 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 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.

+ References

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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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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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 remainder of the 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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