Share Based Payment Award Equity Instruments Other Than Option Forfeited Weighted Average Grant Date Fair Value.

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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)(iv)(3)

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

+ Details

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Balance Type:	na
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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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(i)-(ii)

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

+ Details

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Balance Type:	na
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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ 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)(i)-(ii)

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

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ 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)(2)

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

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ 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)(2)

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

+ Details

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Stockholders' Equity - Non-vested Awards under 2005 Contingent Stock Plan (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock shares awarded	(98,550)	(100,200)	(90,100)
2005 Contingent Stock Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, Ending of year	$ 27.20	$ 17.19	$ 24.93
2005 Contingent Stock Plan [Member] \| Non-vested Restricted Stock Shares Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of non-vested awards, beginning of year	1,386,830
Restricted stock shares issued for new awards	398,230
Restricted stock shares awarded	(347,610)
Restricted stock shares forfeited	(40,100)
Number of non-vested awards, end of year	1,397,350
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, beginning of year	$ 20.08
Restricted stock for new awards, Weighted- Average per Share Market Value on Grant Date during the year	$ 27.12
Restricted stock vested, Weighted- Average per Share Market Value on Grant Date during the year	$ 21.97
Restricted stock forfeited, Weighted- Average per Share Market Value on Grant Date during the year	$ 21.43
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, Ending of year	$ 21.76
2005 Contingent Stock Plan [Member] \| Non-vested Restricted Stock Units Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of non-vested awards, beginning of year	420,800
Restricted stock shares issued for new awards	187,595
Restricted stock shares awarded	(98,550)
Restricted stock shares forfeited	(3,500)
Number of non-vested awards, end of year	506,345
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, beginning of year	$ 20.23
Restricted stock for new awards, Weighted- Average per Share Market Value on Grant Date during the year	$ 27.94
Restricted stock vested, Weighted- Average per Share Market Value on Grant Date during the year	$ 23.48
Restricted stock forfeited, Weighted- Average per Share Market Value on Grant Date during the year	$ 18.17
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, Ending of year	$ 22.92
2005 Contingent Stock Plan [Member] \| Cash Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of non-vested awards, beginning of year	131,680
Restricted stock shares issued for new awards	58,348
Restricted stock shares awarded	(13,950)
Restricted stock shares forfeited	(5,230)
Number of non-vested awards, end of year	170,848