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Stock-based Compensation Plans - TSR - PSUs Activities (Parenthetical) (Detail) - Performance Based TSR - PSUs - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares vested and issued related to performance period number of common stock | [1] | 85,461 |  |
February 2014 Grant |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Return on common stock percentile |  | 67.00% |  |
May 2014 Grant |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Return on common stock percentile |  | 56.00% |  |
Minimum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Potential payout of shares on performance units granted |  | 0.00% | 0.00% | 0.00%
Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Potential payout of shares on performance units granted |  | 150.00% | 150.00% | 150.00%
[1] | Includes 85,461 TSR-PSU awards issued related to the 2014 performance period where the return on our common stock was the 67th percentile for the February 2014 grant and 56th percentile for the May 2014 grant. The remaining 2014 awards are considered to be forfeited.

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- Definition Achieved return on common stock as calculated compared to peers to determine actual payout of the Total Shareholder Return performance units. + References No definition available. + Details
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