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Summary of Restricted Stock Activity (Detail) (Restricted Stock, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance	1,771,664	1,817,745
Restricted stock, Shares,Granted	234,537	394,928
Restricted stock, Shares, Vested	(600,088)	(405,309)
Restricted stock, Shares, Cancellations	(32,360)	(8,945)
Ending Balance	1,373,753	1,798,419
Beginning Balance	$ 41,522	$ 40,655
Restricted stock, Granted, Fair Market Value at Date of Grant	11,211	10,846
Restricted stock, Vested, Fair Market Value at Date of Grant	(11,686)	(9,185)
Restricted stock, Cancellations, Fair Market Value at Date of Grant	(795)	(188)
Ending Balance	$ 40,252	$ 42,128

X

- Definition

The grant date fair value of nonvested equity-based payment instruments excluding stock (or unit) options, that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

The grant date fair value of nonvested equity based payment instruments, excluding stock (or unit) options, that were granted during the period.

+ References

No definition available.

+ Details

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X

- Definition

The grant date fair value of nonvested equity-based payment instruments excluding stock (or unit) options, 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.

+ References

No definition available.

+ Details

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X

- Definition

The grant date fair value of nonvested equity-based payment instruments excluding stock (or unit) options, for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

+ References

No definition available.

+ Details

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X

- 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

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X

- 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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X

- 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

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X

- 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

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