Financial Instruments - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Financial Instruments [Abstract]
Change in exchange rate		10.00%
Carrying value of net asset		$ 23,578
Canadian prime rate		8.05%
Convertible notes, fixed interest rate	5.00%	5.00%
Change in Canadian prime rate		1.00%
Loss due to one percentage change in Canadian prime rate	$ 127	$ 295

Change in Canadian prime rate.

No definition available.

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- Definition

Change in foreign exchange rate.

+ References

No definition available.

+ Details

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- Definition

Financial Instruments [Abstract]

+ References

No definition available.

+ Details

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- Definition

The increase (decrease) in assets and liabilities due to change in exchange rate.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

+ Details

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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