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Stock-based Compensation Plans - PG/RG-PSUs Activities (Parenthetical) (Detail) - Performance-based PG-PSUs and RG-PSUs | 6 Months Ended
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Jun. 30, 2018 Tranche
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Number of tranches forfeited | 1
Total Number of tranches in PSU | 3
Minimum |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout of shares granted | 0.00%
Maximum |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Potential payout of shares granted | 200.00%

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- Definition Number of tranches in the performance grant for which the shares have been forfeited due to performance outcome. + References No definition available. + Details
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Balance Type: | na
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- Definition Total number of performance tranches by year within one performance grant. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
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Balance Type: | na
Period Type: | duration

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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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