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Stock Options Outstanding and Exercisable Price Range Status (Detail)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Shares | shares	2,418,000
Options Exercisable, Shares | shares	1,593,000
$26.68 - $33.95
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum	$ 26.68
Exercise Price Range, maximum	$ 33.95
Options Outstanding, Shares | shares	544,000
Options Outstanding, Weighted Average Exercise Price	$ 31.51
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	6 years 2 months 12 days
Options Exercisable, Shares | shares	216,000
Options Exercisable, Weighted Average Exercise Price	$ 32.03
$34.33 - $36.87
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum	34.33
Exercise Price Range, maximum	$ 36.87
Options Outstanding, Shares | shares	556,000
Options Outstanding, Weighted Average Exercise Price	$ 35.66
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	6 years 10 months 24 days
Options Exercisable, Shares | shares	246,000
Options Exercisable, Weighted Average Exercise Price	$ 35.95
$36.89 - $39.54
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum	36.89
Exercise Price Range, maximum	$ 39.54
Options Outstanding, Shares | shares	484,000
Options Outstanding, Weighted Average Exercise Price	$ 38.01
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	4 years 4 months 24 days
Options Exercisable, Shares | shares	376,000
Options Exercisable, Weighted Average Exercise Price	$ 38.14
$39.84 - $54.30
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum	39.84
Exercise Price Range, maximum	$ 54.30
Options Outstanding, Shares | shares	486,000
Options Outstanding, Weighted Average Exercise Price	$ 45.13
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	3 years 7 months 6 days
Options Exercisable, Shares | shares	407,000
Options Exercisable, Weighted Average Exercise Price	$ 45.67
$55.63 - $70.55
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum	55.63
Exercise Price Range, maximum	$ 70.55
Options Outstanding, Shares | shares	348,000
Options Outstanding, Weighted Average Exercise Price	$ 61.28
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	1 year 7 months 6 days
Options Exercisable, Shares | shares	348,000
Options Exercisable, Weighted Average Exercise Price	$ 61.28

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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

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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

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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

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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

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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

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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=6415400&loc=d3e5070-113901

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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

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