Financial Instruments - Summary of Derivative Instrument Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - Level 3 [Member] - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Time-charter Swap [Member] | ||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Fair value at the beginning of the period | $ 1,345 | $ 0 | ||
| Settlements | (1,096) | (1,222) | ||
| Realized and unrealized gain (loss) | 1,305 | 2,776 | ||
| Fair value at the end of the period | 1,554 | 1,554 | ||
| Stock Purchase Warrant [Member] | ||||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Fair value at the beginning of the period | 916 | $ 5,526 | 5,164 | $ 4,657 |
| Realized and unrealized gain (loss) | (199) | (105) | (4,447) | 764 |
| Fair value at the end of the period | $ 717 | $ 5,421 | $ 717 | $ 5,421 |