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Stock-based Compensation Plans - PG/RG-PSUs Activities (Parenthetical) (Detail) - Performance-based PG-PSUs and RG-PSUs | 12 Months Ended
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Dec. 31, 2017
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 | 150.00%

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- Details
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