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Commitments and Contingencies - Additional Information (Detail) $ in Millions	Jun. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Contingent liability	$ 12

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- References

No definition available.

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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