Equity Method Investments - Additional Information (Detail) - ASV after transaction [Member] - shares	Feb. 28, 2018	Jun. 30, 2019	Feb. 26, 2018
Schedule Of Equity Method Investments [Line Items]
Equity method investment ownership percentage		21.20%	21.20%
Number of shares sold	1,000,000
Percentage of reduction in investment	11.00%

Company's sale of investee stock under Initial Public Offering.

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

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- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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