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Financial instruments - Maximum Credit Risk for these Financial Instruments (Detail) - Dec. 31, 2020 $ in Thousands | USD ($) | CAD ($)
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Cash and cash equivalents and restricted cash | $ 130,018 |
Accounts receivable | 355,151 |
Allowance for doubtful accounts | (29,506) |
Notes receivable | 23,804 |
Maximum exposure to credit risk for financial instruments | 479,467 |
Regulated Services Group |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable | $ 266,225 |

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