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Financial instruments - Maximum Credit Risk for these Financial Instruments (Detail) - Dec. 31, 2018 $ in Thousands, $ in Thousands | CAD ($) | USD ($)
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Fair Value Disclosures [Abstract] |  |
Cash and cash equivalents and restricted cash | $ 27,720 | $ 45,452
Accounts receivable | 13,562 | 241,068
Allowance for doubtful accounts | 0 | (5,281)
Notes receivable | 138,353 | 2,279
Maximum exposure to credit risk for financial instruments | $ 179,635 | $ 283,518

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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