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Shareholders' Equity - Company's Repurchasing Activity by Repurchase Plan (Detail) - $ / shares shares in Thousands | 180 Months Ended | 264 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015
Non-Discretionary Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Cumulative shares repurchased |  | 30,231
Average price per share |  | $ 27.58
Discretionary Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Cumulative shares repurchased | 54,471 |
Average price per share | $ 39.98 |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 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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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: 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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