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Stock-based Compensation Plans - TSR - PSUs Activities (Parenthetical) (Detail) - Performance Based TSR - PSUs | 6 Months Ended
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Jun. 30, 2018 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Shares vested and issued related to performance period number of common stock | 76,149 | [1]
February 2015 Grant |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Return on common stock percentile | 46.00% |
May 2015 Grant |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Return on common stock percentile | 36.00% |
Minimum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Potential payout of shares on performance units granted | 0.00% |
Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Potential payout of shares on performance units granted | 200.00% |
[1] | Includes 76,149 TSR-PSUs awards issued related to the 2015 performance period where the return on our common stock was the 46th percentile for the February 2015 grant and 36th percentile for the May 2015 grant. The remaining 2015 awards are considered to be forfeited.

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