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Summary of Financial Performance Thresholds and Vesting Rates (Detail) - Restricted Stock Units (RSUs) | 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] |  |  |
Threshold IRR | 7.00% | 6.00% | 7.50%
Target IRR | 9.50% | 8.00% | 9.50%
Maximum IRR | 13.00% | 10.00% | 11.50%
Threshold IRR |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Shares Vesting | 33.30% |  |
Targeted IRR |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Shares Vesting | 66.60% |  |
Maximum IRR |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Shares Vesting | 100.00% |  |

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- Definition Percentage of IRR, which is the maximum. + References No definition available. + Details
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Period Type: | duration

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- Definition Percentage of IRR, which is the target. + References No definition available. + Details
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Period Type: | duration

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- Definition Percentage of IRR, which is the threshold. + 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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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Details
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- Details
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- Details
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- Details
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