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Summary of Debt Outstanding (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt [Line Items] |  |  |
Amount outstanding | [1] | $ 428,378 | $ 431,456
Debt premiums and discounts, net |  | 6,535 | 7,548
Less: Current portion of long-term debt |  | (10,002) | (8,568)
Total long-term debt |  | 424,911 | 430,436
8.00% Senior Secured Notes Due August 2022 |  |  |
Debt [Line Items] |  |  |
Secured notes | [2],[3] | 349,794 | 349,954
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] | 11,497 | 12,241
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] | 22,734 | 22,988
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] | 21,502 | 22,116
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS |  |  |
Debt [Line Items] |  |  |
Amount outstanding | [1] | $ 22,851 | $ 24,157
[1] | We pay principal and interest on these notes semi-annually. As of June 30, 2019 and December 31, 2018, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $78.6 million and $81.5 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of June 30, 2019 was 4.99%.
[2] | As of June 30, 2019 and December 31, 2018 the fair value (Level 2) of the Secured Notes was $362.1 million and $359.4 million, respectively.
[3] | In December 2018, we commenced an offer to repurchase up to $25.4 million of the Secured Notes. In January 2019, we repurchased $160,000 of the Secured Notes in accordance with this tender offer obligation. On June 14, 2019, we commenced an offer to repurchase $13.6 million of the Secured Notes with an expiration of July 12, 2019. In July 2019, we repurchased $747 of the Secured Notes in accordance with this tender obligation. The $13.6 million restricted cash on the balance sheet at June 30, 2019, represents proceeds from asset sales since the date of the December 2018 tender offer and is restricted as of that date by the terms of the Indenture.

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