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Business activities and summary of significant accounting policies - Estimated Impact on adoption of ASU 2016-02: Leases (Detail) - Accounting Standards Update No. 2016-02: Leases $ in Millions	Nov. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease, Practical Expedients, Package	true
Lease, Practical Expedient, Lessor Single Lease Component	true
Lessor, Combined Component, Topic	Topic 842
Forecast Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net lease asset	$ 2.3
Lease liabilities	$ 2.4

X

- Definition

Indicates (true false) whether accounting standards update was adopted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

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- Definition

Indicates (true false) whether practical expedient is elected to account for lease component and nonlease component as single lease component.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL117410129-209981

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- Definition

Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 65
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- Definition

Indicates Accounting Standards Codification Topic applied to combined component. Acceptable values are "Topic 842" and "Topic 606".

+ References

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-Name Accounting Standards Codification
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-SubTopic 30
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No definition available.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-SubTopic 20
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+ Details

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Balance Type:	credit
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X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

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-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
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