Share-Based Compensation - Additional Information (Detail)	3 Months Ended	9 Months Ended
Sep. 30, 2015 shares	Sep. 30, 2015 shares
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards exercisable	184,933	184,933
Share based awards forfeited	14,059
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards	19,657	263,677
Share based awards forfeited	4,333
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards		109,665
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards		81,016

Share Based Compensation Arrangement By Share Based Payment Award Shares Forfeited In Period

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii)

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

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- Definition

Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References

No definition available.

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