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Other assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Restricted cash | $ 28,404 | $ 24,787
OPEB plan assets | 10,662 | 8,437
Atlantica related prepaid amount | 0 | 8,844
Long-term deposits | 13,459 | 6,319
Income taxes recoverable | 4,717 | 4,416
Deferred financing costs | 6,774 | 5,477
Other | 11,736 | 8,192
Total other assets | 75,752 | 66,472
Less: current portion | (7,266) | (7,764)
Other assets, noncurrent | $ 68,486 | $ 58,708

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