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Summary of Significant Accounting Policies - Additional Information (Detail) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Property, Plant and Equipment [Line Items] |  |  |  |
Percentage of cash proceeds from monetization of recovered cargo |  |  | 80.00% |
Percentage of subsequent cash proceeds after priority recoupment |  |  | 45.00% |
Short-term investment maturity period |  |  | Three months or less |
Weighted average number of common shares outstanding | 89,781,577 | 85,271,429 | 88,655,418 | 84,707,367
Receiver [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Percentage of cash proceeds from monetization of recovered cargo |  |  | 20.00% |
Percentage of subsequent cash proceeds after priority recoupment |  |  | 55.00% |
Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, estimated useful life |  |  | 3 years |
Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and Equipment, estimated useful life |  |  | 30 years |

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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