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Share-based Compensation - Schedule of Stock Options Outstanding and Exercisable by Exercise Price Range (Detail) | 12 Months Ended
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Dec. 31, 2016 $ / shares shares
$16.62 – $25.01 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | $ 16.62
Exercise price, high end of range (in dollars per share) | $ 25.01
Number outstanding (in shares) | shares | 106,207
Weighted Average Remaining Contractual Life of options outstanding (in years) | 5 years 8 months 27 days
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 22.32
Number Exercisable (in shares) | shares | 80,271
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 22.55
$25.05 – $29.23 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 25.05
Exercise price, high end of range (in dollars per share) | $ 29.23
Number outstanding (in shares) | shares | 102,750
Weighted Average Remaining Contractual Life of options outstanding (in years) | 5 years 22 days
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 27.57
Number Exercisable (in shares) | shares | 82,750
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 27.82
$30.78 – $32.28 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 30.78
Exercise price, high end of range (in dollars per share) | $ 32.28
Number outstanding (in shares) | shares | 99,650
Weighted Average Remaining Contractual Life of options outstanding (in years) | 6 years 7 months 17 days
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 31.96
Number Exercisable (in shares) | shares | 57,288
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 31.90
$33.12 – $33.12 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 33.12
Exercise price, high end of range (in dollars per share) | $ 33.12
Number outstanding (in shares) | shares | 142,815
Weighted Average Remaining Contractual Life of options outstanding (in years) | 8 years 6 months
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 33.12
Number Exercisable (in shares) | shares | 35,708
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 33.12
$33.24 – $36.25 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 33.24
Exercise price, high end of range (in dollars per share) | $ 36.25
Number outstanding (in shares) | shares | 121,875
Weighted Average Remaining Contractual Life of options outstanding (in years) | 7 years 8 months 27 days
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 35.51
Number Exercisable (in shares) | shares | 52,051
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 35.82
$36.46 – $40.19 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 36.46
Exercise price, high end of range (in dollars per share) | $ 40.19
Number outstanding (in shares) | shares | 262,750
Weighted Average Remaining Contractual Life of options outstanding (in years) | 6 years 7 months 21 days
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 38.93
Number Exercisable (in shares) | shares | 45,438
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 39.24
$41.73 – $42.89 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 41.73
Exercise price, high end of range (in dollars per share) | $ 42.89
Number outstanding (in shares) | shares | 59,500
Weighted Average Remaining Contractual Life of options outstanding (in years) | 4 years 8 months 16 days
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 41.93
Number Exercisable (in shares) | shares | 37,500
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 41.37
$44.39 – $44.39 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 44.39
Exercise price, high end of range (in dollars per share) | $ 44.39
Number outstanding (in shares) | shares | 168,432
Weighted Average Remaining Contractual Life of options outstanding (in years) | 9 years 6 months
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 44.39
$44.87 – $50.50 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 44.87
Exercise price, high end of range (in dollars per share) | $ 50.50
Number outstanding (in shares) | shares | 65,700
Weighted Average Remaining Contractual Life of options outstanding (in years) | 5 months 23 days
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 45.17
Number Exercisable (in shares) | shares | 65,700
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 45.17
$50.99 – $50.99 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 50.99
Exercise price, high end of range (in dollars per share) | $ 50.99
Number outstanding (in shares) | shares | 7,500
Weighted Average Remaining Contractual Life of options outstanding (in years) | 15 days
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 50.99
Number Exercisable (in shares) | shares | 7,500
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 50.99
$16.62 – $50.99 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price, low end of range (in dollars per share) | 16.62
Exercise price, high end of range (in dollars per share) | $ 50.99
Number outstanding (in shares) | shares | 1,137,179
Weighted Average Remaining Contractual Life of options outstanding (in years) | 6 years 8 months 9 days
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 36.05
Number Exercisable (in shares) | shares | 464,206
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 33.76

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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 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=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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