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Stock Buy Back Plans - Number of Shares Purchased and Maximum Value of Shares That yet be Purchased Under Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2016 | Jul. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Mar. 31, 2016 | Feb. 28, 2016 | Dec. 31, 2016 | Jan. 31, 2016
Equity [Abstract] |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased | 299,931 | 66,422 | 330,265 | 307,798 | 454,729 | 269,099 | 943,983 | 2,672,227 |
Average Price Paid Per Share | $ 40.92 | $ 41.03 | $ 39.96 | $ 38.34 | $ 38.78 | $ 38.27 | $ 33.97 | $ 37.42 |
Total Number of Shares Purchased as Part of Publicly Announced Plan | 299,931 | 66,422 | 330,265 | 307,798 | 454,729 | 269,099 | 943,983 | 2,672,227 |
Maximum Value of Shares that May Yet Be Purchased Under the Plan |  | $ 12,275 | $ 15,000 | $ 28,199 | $ 40,000 | $ 57,632 | $ 67,932 |  | $ 100,000

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