Long-Term Debt - Additional Information - Other (Details) $ in Thousands	Sep. 30, 2017 USD ($) credit_facility	Dec. 31, 2016 USD ($) credit_facility
Debt Instrument [Line Items]
Carrying amount of debt	$ 3,077,553	$ 3,182,894
Weighted-average effective interest rate	3.50%	3.00%
Aggregate principal repayments, remainder of 2017	$ 220,900
Aggregate principal repayments, 2018	615,400
Aggregate principal repayments, 2019	781,300
Aggregate principal repayments, 2020	350,900
Aggregate principal repayments, 2021	304,900
Aggregate principal repayments, thereafter	849,500
Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal repayments, remainder of 2017	71,300
Aggregate principal repayments, 2018	144,700
Aggregate principal repayments, 2019	$ 6,400
Number of credit facilities \| credit_facility	4	5
Collateralized Debt Obligations \| Revolving Credit Facility
Debt Instrument [Line Items]
Number of credit facilities \| credit_facility	2
Collateralized Debt Obligations \| Term Loan
Debt Instrument [Line Items]
Number of credit facilities \| credit_facility	6
Minimum \| Collateralized Debt Obligations \| Term Loan \| Line of Credit One
Debt Instrument [Line Items]
Asset value to outstanding drawn principal balance ratio	113.00%
Vessel values to drawn principal balance ratios	117.07%
Maximum \| Collateralized Debt Obligations \| Term Loan \| Line of Credit One
Debt Instrument [Line Items]
Asset value to outstanding drawn principal balance ratio	125.00%
Vessel values to drawn principal balance ratios	382.00%
Interest Rate Swap \| Minimum
Debt Instrument [Line Items]
Range of credit facility margin (as a percent)	0.30%	0.30%
Interest Rate Swap \| Maximum
Debt Instrument [Line Items]
Range of credit facility margin (as a percent)	4.75%	4.00%
ALP Maritime Services B.V.
Debt Instrument [Line Items]
Carrying amount of debt	$ 66,600
Fixed interest rate	2.93%

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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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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-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
-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 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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 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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- Definition

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

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