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Financial instruments - Maximum Credit Risk for these Financial Instruments (Detail) - Dec. 31, 2019 $ in Thousands, $ in Thousands | USD ($) | CAD ($)
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Fair Value Disclosures [Abstract] |  |
Cash and cash equivalents and restricted cash | $ 45,989 | $ 53,619
Accounts receivable | 231,006 | 42,987
Allowance for doubtful accounts | (4,850) | (89)
Notes receivable | 50,680 | 15,963
Maximum exposure to credit risk for financial instruments | $ 322,825 | $ 112,480

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