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Total Shareholder Return Percentiles and Number of Shares Issued (Detail) - Performance Units Awards | 12 Months Ended
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Dec. 31, 2016 shares
2012 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Total shareholder return percentile for performance period | 87.00%
Shares issued | 384,000
2011 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Total shareholder return percentile for performance period | 94.00%
Shares issued | 288,750

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