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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 $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2013
Equity [Abstract] |  |  |  |  |
Total Number of Shares Purchased | 351,313 |  |  | 26,593 | 377,906
Average Price Paid Per Share | $ 36.69 |  |  | $ 33.94 | $ 36.49
Total Number of Shares Purchased as Part of Publicly Announced Plan | 351,313 |  |  | 26,593 | 377,906
Maximum Value of Shares that May Yet Be Purchased Under the Plan |  | $ 12,888 | $ 12,888 | $ 12,888 |

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- Definition Stock Repurchase Program Number Of Shares Repurchased During Period + References No definition available. + Details
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- Details
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- Definition Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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