Stockholders' Equity (Summary of Activity Related to Restricted Stock Units) (Detail)	9 Months Ended
Sep. 30, 2014
Performance Shares [Member]
Unvested shares
Outstanding, shares at December 31, 2013
Granted	54,723
Forfeited
Vested
Outstanding, shares at September 30, 2014	54,723
2014 Incentive Award Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Unvested shares
Outstanding, shares at December 31, 2013
Granted	12,350
Forfeited
Vested and issued
Vested and unissued
Outstanding, shares at September 30, 2014	12,350
2004 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Unvested shares
Outstanding, shares at December 31, 2013	1,299,466
Granted	491,405
Forfeited	(29,362)
Vested and issued	(491,192)
Vested and unissued	(70,422)
Outstanding, shares at September 30, 2014	1,199,895

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

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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Period Type:	duration

- 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 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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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

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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