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Treasury Stock Acquisition (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Treasury Stock [Line Items] |  |  |
Treasury shares at beginning of period | 43,392,617 | 43,207,240 | 42,818,585
Treasury shares at end of period | 43,802,611 | 43,392,617 | 43,207,240
Treasury shares at beginning of period | $ 911,094 | $ 907,045 | $ 899,035
Treasury stock acquired, cost | 7,617 | 4,049 | 8,010
Treasury shares at end of period | $ 918,711 | $ 911,094 | $ 907,045
2013 Stock Buyback Program |  |  |
Schedule of Treasury Stock [Line Items] |  |  |
Treasury stock acquired, shares | 5,503 | 8,488 | 8,618
Treasury stock acquired, cost | $ 109 | $ 183 | $ 180
Long Term Incentive Plan |  |  |
Schedule of Treasury Stock [Line Items] |  |  |
Treasury stock acquired, shares | 404,491 | 176,889 | 380,037
Treasury stock acquired, cost | $ 7,508 | $ 3,866 | $ 7,830

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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- 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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=84159872&loc=d3e21463-112644 + Details
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