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Stock-Based Compensation Plans - Restricted Stock Granted (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Restricted Stock Unit [Line Items]
Restricted stock grants	300,900
Restricted stock grants, Weighted average grant date fair value	$ 34.64
Minimum [Member]
Schedule of Restricted Stock Unit [Line Items]
Restricted stock vesting period, Years	3 years
Maximum [Member]
Schedule of Restricted Stock Unit [Line Items]
Restricted stock vesting period, Years	5 years
Restricted Stock [Member]
Schedule of Restricted Stock Unit [Line Items]
Restricted stock grants	300,900	296,017	258,284
Restricted stock grants, Weighted average grant date fair value	$ 34.64	$ 32.62	$ 35.27
Restricted Stock [Member] | Minimum [Member]
Schedule of Restricted Stock Unit [Line Items]
Restricted stock vesting period, Years	3 years	3 years	3 years
Restricted Stock [Member] | Maximum [Member]
Schedule of Restricted Stock Unit [Line Items]
Restricted stock vesting period, Years	5 years	5 years	5 years
Restricted Stock [Member] | Employees [Member]
Schedule of Restricted Stock Unit [Line Items]
Restricted stock grants	280,900	276,017	246,284
Restricted Stock [Member] | Outside Directors [Member]
Schedule of Restricted Stock Unit [Line Items]
Restricted stock grants	20,000	20,000	12,000

X

- Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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