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Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under U.S. GAAP Guidance (Parenthetical) (Detail) $ in Millions | Mar. 31, 2018 USD ($)
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Other Assets [Member] | Level 3 [Member] | Non-recurring Basis [Member] |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Equity securities, Assets | $ 30.9

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- Definition Fair value of the entity's equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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