Share-based Compensation Plans - Schedule of Stock Options Outstanding and Exercisable by Price Range (Detail) (USD $)	12 Months Ended
Dec. 31, 2013
$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)	232,250
Weighted Average Remaining Contractual Life of options outstanding (in years)	9 years 3 months 22 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 20.79
Number Exercisable (in shares)	16,000
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 13.31
$22.75 - $25.05 [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)	$ 25.05
Number outstanding (in shares)	326,166
Weighted Average Remaining Contractual Life of options outstanding (in years)	4 years 1 month 6 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 24.73
Number Exercisable (in shares)	306,166
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 24.84
$26.79 - $28.95 [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)	$ 26.79
Exercise price, high end of range (in dollars per share)	$ 28.95
Number outstanding (in shares)	230,000
Weighted Average Remaining Contractual Life of options outstanding (in years)	4 years 9 months 15 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 28.45
Number Exercisable (in shares)	170,000
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 28.65
$29.23 - $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)	$ 29.23
Exercise price, high end of range (in dollars per share)	$ 37.36
Number outstanding (in shares)	225,168
Weighted Average Remaining Contractual Life of options outstanding (in years)	5 years 1 month 6 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 33.14
Number Exercisable (in shares)	169,839
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 32.41
$37.76 - $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)	$ 37.76
Exercise price, high end of range (in dollars per share)	$ 38.11
Number outstanding (in shares)	230,975
Weighted Average Remaining Contractual Life of options outstanding (in years)	1 year 8 months 9 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 37.99
Number Exercisable (in shares)	230,975
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 37.99
$38.40 - $40.27 [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)	$ 38.40
Exercise price, high end of range (in dollars per share)	$ 40.27
Number outstanding (in shares)	351,354
Weighted Average Remaining Contractual Life of options outstanding (in years)	3 years 2 months 1 day
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 39.76
Number Exercisable (in shares)	174,355
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 39.77
$41.33 - $43.04 [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)	$ 41.33
Exercise price, high end of range (in dollars per share)	$ 43.04
Number outstanding (in shares)	178,633
Weighted Average Remaining Contractual Life of options outstanding (in years)	2 years 10 months 2 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 41.66
Number Exercisable (in shares)	150,301
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 41.72
$44.87 - $45.84 [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)	$ 45.84
Number outstanding (in shares)	140,133
Weighted Average Remaining Contractual Life of options outstanding (in years)	3 years 18 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 45.02
Number Exercisable (in shares)	140,133
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 45.02
$50.50 - $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)	$ 50.50
Exercise price, high end of range (in dollars per share)	$ 50.50
Number outstanding (in shares)	2,000
Weighted Average Remaining Contractual Life of options outstanding (in years)	3 years 4 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 50.50
Number Exercisable (in shares)	2,000
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 50.50
$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)	7,500
Weighted Average Remaining Contractual Life of options outstanding (in years)	3 years 15 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 50.99
Number Exercisable (in shares)	7,500
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 50.99
$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)	1,924,179
Weighted Average Remaining Contractual Life of options outstanding (in years)	4 years 4 months 28 days
Weighted Average Exercise Price of options outstanding (in dollars per share)	$ 33.12
Number Exercisable (in shares)	1,367,269
Weighted Average Exercise Price of options exercisable (in dollars per share)	$ 34.35

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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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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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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