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Share Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | May 31, 2018
Class of Stock Disclosures [Abstract] |  |  |  |  |
Additional common stock shares, authorized for repurchase |  |  |  |  | 700,000
Purchase of treasury stock, shares | 269,734 | 0 | 311,056 | 0 |
Purchase of treasury stock, per share value | $ 33.28 |  | $ 33.55 |  |
Purchase of treasury stock | $ 8,975 |  | $ 10,434 |  |
Common stock shares, available for repurchase | 700,000 |  | 700,000 |  |

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the weighted average method. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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