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Other assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Restricted cash | $ 24,787 | $ 18,954
OPEB plan assets | 8,437 | 3,161
Atlantica related prepaid amount | 8,844 | 0
Long-term deposits | 6,319 | 1,207
Income taxes recoverable | 4,416 | 1,961
Deferred financing costs | 5,477 | 4,449
Other | 8,192 | 4,967
Total other assets | 66,472 | 34,699
Less: current portion | (7,764) | (6,115)
Other assets, noncurrent | $ 58,708 | $ 28,584

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