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Regulatory Requirements - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Regulatory Capital Requirements [Abstract] |
Minimum period required for financial resources to cover operating costs | 1 year
Minimum period required for cash or highly liquid securities to cover operating costs | 6 months
Net assets held by regulated subsidiaries | $ 561.9
Amount of capital in excess of aggregate regulatory requirements | $ 291.2

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- Definition Regulatory requirement minimum period of cash or highly liquid securities to cover operating costs. + References No definition available. + Details
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- Definition Regulatory requirement minimum period of financial resources to cover operating costs. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount by which the company's Total Capital exceeds the minimum required for capital adequacy purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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