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Stock Plans - Schedule of Exercise Price Ranges, Characteristics of Outstanding Stock Options (Detail) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
$17.83 – $33.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, minimum (dollars per share) | $ 17.83
Range of Exercise Prices, maximum (dollars per share) | $ 33.00
Stock Options Outstanding, Shares | shares | 85,607
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) | $ 23.98
Stock Options Outstanding, Weighted-Average Remaining Life | 1 year 9 months 26 days
Stock Options Exercisable, Shares | shares | 85,607
Stock Options Exercisable, Weighted-Average Exercise Price (dollars per share) | $ 23.98
Stock Options Exercisable, Weighted-Average Remaining Life | 1 year 9 months 26 days
$33.01 – $45.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, minimum (dollars per share) | $ 33.01
Range of Exercise Prices, maximum (dollars per share) | $ 45.00
Stock Options Outstanding, Shares | shares | 464,364
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) | $ 40.23
Stock Options Outstanding, Weighted-Average Remaining Life | 5 years 7 months 2 days
Stock Options Exercisable, Shares | shares | 260,278
Stock Options Exercisable, Weighted-Average Exercise Price (dollars per share) | $ 36.88
Stock Options Exercisable, Weighted-Average Remaining Life | 3 years 6 months 26 days
$45.01 – $51.69 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, minimum (dollars per share) | $ 45.01
Range of Exercise Prices, maximum (dollars per share) | $ 51.69
Stock Options Outstanding, Shares | shares | 405,475
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) | $ 49.61
Stock Options Outstanding, Weighted-Average Remaining Life | 5 years 11 months 16 days
Stock Options Exercisable, Shares | shares | 268,529
Stock Options Exercisable, Weighted-Average Exercise Price (dollars per share) | $ 50.10
Stock Options Exercisable, Weighted-Average Remaining Life | 5 years 4 months 2 days
$17.83 – $51.69 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, minimum (dollars per share) | $ 17.83
Range of Exercise Prices, maximum (dollars per share) | $ 51.69
Stock Options Outstanding, Shares | shares | 955,446
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) | $ 42.75
Stock Options Outstanding, Weighted-Average Remaining Life | 5 years 4 months 28 days
Stock Options Exercisable, Shares | shares | 614,414
Stock Options Exercisable, Weighted-Average Exercise Price (dollars per share) | $ 40.86
Stock Options Exercisable, Weighted-Average Remaining Life | 4 years 1 month 6 days

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of exercisable 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are 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=96867065&loc=d3e5070-113901 + Details
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