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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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- Definition

Fair Value, Concentration of Risk, Financial Instruments

+ References

No definition available.

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- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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