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Stock-Based Compensation Plans - Additional Information 1 (Detail) | 6 Months Ended |
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Jun. 30, 2015 Plans shares | Dec. 31, 2014 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Active equity-based stock plans | 1 |
Stock Appreciation Rights (SARs) |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of stock option outstanding | shares | 1,529,842 | 1,966,549

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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