Share-based Compensation Plans - Schedule of Stock Options Outstanding and Exercisable by Price Range (Detail) (USD $)	12 Months Ended
Dec. 31, 2014
$10.42 - $21.78 [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)	$ 10.42
Exercise price, high end of range (in dollars per share)	$ 21.78
Number outstanding (in shares)	164,750
Weighted Average Remaining Contractual Life of options outstanding (in years)	7 years
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 21.11
Number Exercisable (in shares)	47,565
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 20.41
$22.75 – $27.97 [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)	$ 22.75
Exercise price, high end of range (in dollars per share)	$ 27.97
Number outstanding (in shares)	141,333
Weighted Average Remaining Contractual Life of options outstanding (in years)	5 years 11 months 19 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 24.87
Number Exercisable (in shares)	81,333
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 24.64
$27.98 – $31.40 [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)	$ 27.98
Exercise price, high end of range (in dollars per share)	$ 31.40
Number outstanding (in shares)	151,500
Weighted Average Remaining Contractual Life of options outstanding (in years)	5 years 2 months 23 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 29.27
Number Exercisable (in shares)	119,000
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 29.34
$31.83 – $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)	$ 31.83
Exercise price, high end of range (in dollars per share)	$ 36.25
Number outstanding (in shares)	238,425
Weighted Average Remaining Contractual Life of options outstanding (in years)	8 years 2 months 27 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 34.25
Number Exercisable (in shares)	44,000
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 31.83
$37.36 – $37.36 [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)	$ 37.36
Exercise price, high end of range (in dollars per share)	$ 37.36
Number outstanding (in shares)	53,334
Weighted Average Remaining Contractual Life of options outstanding (in years)	5 years 3 months 7 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 37.36
Number Exercisable (in shares)	41,334
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 37.36
$38.11 – $38.11 [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)	$ 38.11
Exercise price, high end of range (in dollars per share)	$ 38.11
Number outstanding (in shares)	142,075
Weighted Average Remaining Contractual Life of options outstanding (in years)	1 year 2 months 19 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 38.11
Number Exercisable (in shares)	142,075
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 38.11
$38.82 – $39.94 [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)	$ 38.82
Exercise price, high end of range (in dollars per share)	$ 39.94
Number outstanding (in shares)	299,687
Weighted Average Remaining Contractual Life of options outstanding (in years)	3 years 5 months 9 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 39.32
Number Exercisable (in shares)	137,021
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 39.83
$40.27 – $41.37 [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)	$ 40.27
Exercise price, high end of range (in dollars per share)	$ 41.37
Number outstanding (in shares)	157,500
Weighted Average Remaining Contractual Life of options outstanding (in years)	1 year 9 months 26 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 41.18
Number Exercisable (in shares)	145,001
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 41.16
$43.04 – $44.97 [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)	$ 43.04
Exercise price, high end of range (in dollars per share)	$ 44.97
Number outstanding (in shares)	160,732
Weighted Average Remaining Contractual Life of options outstanding (in years)	1 year 8 months 27 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 44.61
Number Exercisable (in shares)	160,732
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 44.61
$45.84– $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)	$ 45.84
Exercise price, high end of range (in dollars per share)	$ 50.99
Number outstanding (in shares)	18,500
Weighted Average Remaining Contractual Life of options outstanding (in years)	1 year 11 months 1 day
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 48.43
Number Exercisable (in shares)	18,500
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 48.43
$10.42 - $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)	$ 10.42
Exercise price, high end of range (in dollars per share)	$ 50.99
Number outstanding (in shares)	1,527,836
Weighted Average Remaining Contractual Life of options outstanding (in years)	4 years 5 months 23 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 34.91
Number Exercisable (in shares)	936,561
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 36.64

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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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- 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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- 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

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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=6415400&loc=d3e5070-113901

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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

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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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