v3.8.0.1

Acquisition of SPT - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2015 USD ($) vessel $ / shares | Jul. 31, 2015 vessel $ / shares shares | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) vessel $ / shares | Aug. 31, 2015 $ / shares | Jan. 31, 2015 $ / shares | Aug. 31, 2014 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  | $ 0 | $ 31,870 | $ 0 |  |  |
Shares issued, price per share (in dollars per share) | $ / shares | $ 6.99 | $ 6.99 |  |  |  | $ 4.80 | $ 6.65 | $ 4.57 | $ 4.03
Ship to Ship Transfer Business [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquisition | $ 47,300 |  |  |  |  |  |  |  |
Increase of goodwill |  |  | $ 8,100 |  |  |  |  |  |
Decrease in intangible assets |  |  | $ 8,400 |  |  |  |  |  |
Ship to Ship Transfer Business [Member] | Class B [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  | 6,511,812 |  |  |  |  |  |  |
Ship to Ship Transfer Business [Member] | Parent Company [Member] | Class B [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares | $ 6.99 | $ 6.99 |  |  |  |  |  |  |
Ship to Ship Transfer Business [Member] | Working Capital [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquisition | $ 1,800 |  |  |  |  |  |  |  |
Ship-to-ship Support Vessel [Member] | Ship to Ship Transfer Business [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels | vessel | 6 | 6 |  |  |  |  |  |  |
Aframax Tankers [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  |  | 1 |  |  |
Time-charter [Member] | Aframax Tankers [Member] | Ship to Ship Transfer Business [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels | vessel | 1 | 1 |  |  |  |  |  |  |

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