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v3.19.1

Employee Benefit Plans and Similar Obligations - Summary of Share Based Compensation Plan (Plan 2015-2018 (Parenthetical) (Detail) - Plan 2015-18 [member] | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Average remaining life of plan | 7 months | 7 months |
Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Average remaining life of plan |  |  | 7 months
Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Average remaining life of plan |  |  | 19 months

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Share Based Benefit Plan Average Remaining Life + References No definition available. + Details
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- Details
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- Details
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- Details
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