Summary of Awards Authorized (Detail) - Performance Shares - shares	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Number of Shares Awarded	383,814	211,593	563,803
Potential Number of Performance-Based Shares to be Vested	526,879	211,593	400,539
Potential Number of Performance-Based Shares to be Vested period	2018	2017	2016

Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Expected to Vest

No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Other Than Options Expected Vesting Period

+ References

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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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