Stockholders' Equity (Summary of Activity Related to Restricted Stock Units) (Detail)	9 Months Ended
Sep. 30, 2015 shares
Restricted Stock Units (RSUs) [Member]
Unvested shares
Outstanding, shares at December 31, 2014	1,200,884
Granted	328,034
Forfeited	(32,485)
Vested and issued	(432,165)
Vested and unissued	(46,521)
Outstanding, shares at September 30, 2015	1,017,747
Performance Shares [Member]
Unvested shares
Outstanding, shares at December 31, 2014	54,723
Granted	238,690
Outstanding, shares at September 30, 2015	293,413

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

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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 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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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Rollforward [Abstract]

+ References

No definition available.

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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.

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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.

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