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Stock-Settled Performance Units (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2016 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

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