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New Accounting Pronouncements - Additional Information (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
Operating lease, Percentage of office facilities | 96.00%
ASU 2018-02 [Member] |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
Reclassification between AOCI and retained earnings | $ 0.1

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- Definition Percentage of office facilities in operating lease. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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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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Balance Type: | na
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- Details
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