v3.8.0.1

Operating Leases (Detail) $ in Millions | Dec. 31, 2016 USD ($) vessel | Dec. 31, 2015 USD ($)
--- | --- | ---
Operating Leased Assets [Line Items] |  |
Minimum commitment to be incurred by Company, 2017 | $ 26.8 |
Minimum commitment to be incurred by Company, 2018 | 8.3 |
Minimum commitment to be incurred by Company, 2019 | 8.3 |
Minimum commitment to be incurred by Company, 2020 | 8.3 |
Minimum commitment to be incurred by Company, 2021 | 1.4 |
Minimum scheduled future revenues to be received by Company | 136.5 |
Minimum scheduled future revenues to be received by Company in current year | 93.4 |
Minimum scheduled future revenues to be received by Company in second year | 40.5 |
Minimum scheduled future revenues to be received by Company in third year | 2.6 |
Carrying amount of vessels employed on operating leases | 471.7 | $ 442.5
Cost of the vessels | 683.2 | 596.7
Accumulated depreciation of the vessels | $ 211.5 | $ 154.2
Charters In [Member] |  |
Operating Leased Assets [Line Items] |  |
Number of vessels | vessel | 7 |
Charters In [Member] | Commitments [Member] |  |
Operating Leased Assets [Line Items] |  |
Number of vessels | vessel | 9 |
Charters In [Member] | Commitments [Member] | Ship-to-ship Support Vessel [Member] |  |
Operating Leased Assets [Line Items] |  |
Number of vessels | vessel | 2 |
Charters Out [Member] |  |
Operating Leased Assets [Line Items] |  |
Number of vessels | vessel | 1 |
Number of vessels | vessel | 13 |
Charters Out [Member] | Time Charter Contract Expiration 2017 [Member] |  |
Operating Leased Assets [Line Items] |  |
Number of vessels | vessel | 7 |
Charters Out [Member] | Time Charter Contract Expiration 2018 [Member] |  |
Operating Leased Assets [Line Items] |  |
Number of vessels | vessel | 6 |
Charters Out [Member] | Time Charter Contract Expiration 2019 [Member] |  |
Operating Leased Assets [Line Items] |  |
Number of vessels | vessel | 1 |

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77907726&loc=d3e41460-112716 + Details
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