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Share Based Compensation Plans - Information Pertaining to Outstanding and Exercisable Options (Detail) (USD $) | 9 Months Ended
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Sep. 30, 2014
Range of Exercise Prices |
Range of Exercise Prices, Minimum | $ 21.14
Range of Exercise Prices, Maximum | $ 40.14
Number Outstanding | 150,580
Weighted Average Remaining Contractual Life (Years) | 3 years 2 months 27 days
Weighted Average Exercise Price | $ 31.14
Range One [Member] |
Range of Exercise Prices |
Range of Exercise Prices, Minimum | $ 21.14
Range of Exercise Prices, Maximum | $ 24.99
Number Outstanding | 42,985
Weighted Average Remaining Contractual Life (Years) | 5 years 6 months 18 days
Weighted Average Exercise Price | $ 21.41
Range Two [Member] |
Range of Exercise Prices |
Range of Exercise Prices, Minimum | $ 25
Range of Exercise Prices, Maximum | $ 29.99
Number Outstanding | 2,792
Weighted Average Remaining Contractual Life (Years) | 5 years 6 months 4 days
Weighted Average Exercise Price | $ 25.76
Range Three [Member] |
Range of Exercise Prices |
Range of Exercise Prices, Minimum | $ 30
Range of Exercise Prices, Maximum | $ 34.99
Number Outstanding | 45,470
Weighted Average Remaining Contractual Life (Years) | 3 years 0 months 7 days
Weighted Average Exercise Price | $ 31.25
Range Four [Member] |
Range of Exercise Prices |
Range of Exercise Prices, Minimum | $ 35
Range of Exercise Prices, Maximum | $ 39.99
Number Outstanding | 29,567
Weighted Average Remaining Contractual Life (Years) | 2 years 6 months 22 days
Weighted Average Exercise Price | $ 36.54
Range Five [Member] |
Range of Exercise Prices |
Range of Exercise Prices, Minimum | $ 40
Range of Exercise Prices, Maximum | $ 40.14
Number Outstanding | 29,766
Weighted Average Remaining Contractual Life (Years) | 8 months 19 days
Weighted Average Exercise Price | $ 40.14

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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: 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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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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