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Stock-Settled Performance Units (Detail) - Performance Units Awards | 6 Months Ended
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Jun. 30, 2015 shares
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
2012 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Target number of shares | 192,000
2011 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Target number of shares | 144,375

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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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