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Stock-based Compensation Plans - PGPS/RGPS Activities (Parenthetical) (Detail) - Performance-based PGPS/RGPS | 6 Months Ended
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Jun. 30, 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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- Definition Potential payout of shares granted. + References No definition available. + Details
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Period Type: | duration

X
- 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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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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