Long-Term Debt - Additional Information - Other (Detail) $ in Millions	Jun. 30, 2016 USD ($) CreditFacility	Dec. 31, 2015
Debt Instrument [Line Items]
Weighted-average effective interest rate	3.40%	3.20%
Aggregate principal repayments, remainder of 2016	$ 197.9
Aggregate principal repayments, 2017	640.2
Aggregate principal repayments, 2018	623.5
Aggregate principal repayments, 2019	755.3
Aggregate principal repayments, 2020	264.8
Aggregate principal repayments, thereafter	817.4
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Aggregate principal repayments, remainder of 2016	58.3
Aggregate principal repayments, 2017	166.7
Aggregate principal repayments, 2018	115.4
Aggregate principal repayments, 2019	$ 43.0
Number of credit facilities \| CreditFacility	5
Collateralized Debt Obligations [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Number of credit facilities \| CreditFacility	2
Number of credit facilities undrawn \| CreditFacility	1
Collateralized Debt Obligations [Member] \| Term loans [Member]
Debt Instrument [Line Items]
Number of credit facilities \| CreditFacility	5
Number of credit facilities undrawn \| CreditFacility	1
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Lower range of credit facility margin	0.30%	0.30%
Higher range of credit facility margin	4.00%	4.00%
Minimum [Member] \| Line of Credit One [Member] \| Collateralized Debt Obligations [Member] \| Term loans [Member]
Debt Instrument [Line Items]
Asset value to outstanding drawn principal balance ratio	113.00%
Vessel values to drawn principal balance ratios	125.00%
Maximum [Member] \| Line of Credit One [Member] \| Collateralized Debt Obligations [Member] \| Term loans [Member]
Debt Instrument [Line Items]
Asset value to outstanding drawn principal balance ratio	125.00%
Vessel values to drawn principal balance ratios	195.00%

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Number of Credit Facilities Undrawn

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Vessel Market Value To Loan Ratio

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High end of the range of percentage points added to the reference rate to compute the variable rate on the group of interest rate derivatives.

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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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+ 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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-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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Weighted average interest rate of long-term debt outstanding.

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