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v3.8.0.1

Performance Units (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2018 shares
2017 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Target number of shares | 186,198
2016 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Target number of shares | 185,000
2015 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Target number of shares | 190,600
2014 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Target number of shares | 154,000
2013 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Target number of shares | 236,500

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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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