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Share-Based Compensation - Schedule of Performance Based Awards Goals with Respect to TSR and ROIC (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
TSR Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Threshold Performance of Shares, percentage | 50.00% | 50.00% | 50.00%
Target Performance of Shares, percentage | 100.00% | 100.00% | 100.00%
Maximum Performance of Shares, percentage | 150.00% | 150.00% | 150.00%
Threshold Performance, percentage | 35.00% | 35.00% | 35.00%
Target Performance, percentage | 50.00% | 50.00% | 50.00%
Maximum Performance, percentage | 75.00% | 75.00% | 75.00%
ROIC Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Threshold Performance of Shares, percentage | 35.00% | 35.00% | 35.00%
Target Performance of Shares, percentage | 100.00% | 100.00% | 100.00%
Maximum Performance of Shares, percentage | 150.00% | 150.00% | 150.00%
Threshold Performance, percentage | 15.00% | 15.50% | 11.00%
Target Performance, percentage | 17.50% | 18.00% | 12.50%
Maximum Performance, percentage | 20.00% | 20.50% | 14.00%

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- Definition Share based compensation arrangement by share based payment award based on threshold performance achievement percentage. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award percentage of shares issuable based on threshold performance. + References No definition available. + Details
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- Definition Share based compensation arrangement by share-based payment award based on maximum performance achievement percentage. + References No definition available. + Details
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- Definition Share based compensation arrangement by share-based payment award based on target performance achievement percentage. + References No definition available. + Details
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- Definition Share based compensation arrangement by share-based payment award percentage of shares issuable based on maximum performance. + References No definition available. + Details
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- Definition Share based compensation arrangement by share-based payment award, percentage of shares Issuable based on target performance. + References No definition available. + Details
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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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