Maximum expected term of options under incentive compensation plans.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Earned In Period

+ References

No definition available.

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- Definition

Share based payment award options exercisable over the next twelve months.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant 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 (a)(1)
-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 weighted average fair value at grant date for nonvested equity-based awards issued 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

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.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Net number of share options (or share units) granted during the 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)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of options vested.

+ References

No definition available.

+ Details

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended						12 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011	Mar. 31, 2010	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum expected term of options under incentive compensation plans							10 years
Stock option long term incentive plan granted vesting portion per year							One-third each year
Stock options, granted							0
Stock options exercisable over the next twelve months							202,787
Weighted average remaining contractual life of options outstanding							6 years 8 months 12 days
Unvested compensation cost related to stock options							$ 548
Unvested compensation cost related to stock options recognized as expense							13 months
Shares available for future issuance under equity compensation plans							1,825,402
Excess tax benefits							$ 4,323	$ 1,268	$ 494
Long-Term Incentive Plan 2010-2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units granted						303,120
Long-Term Incentive Plan 2011- 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units granted					311,670
Long-Term Incentive Plan 2012- 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units granted				589,934
Long-Term Incentive Plan 2013- 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units granted			330,639
Long Term Incentive Plan 2014-2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units granted		380,064
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of option granted								$ 12.26	$ 12.97
Weighted Average fair value of option granted								$ 12.26	12.97
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested compensation cost related to stock options							$ 2,551
Unvested compensation cost related to stock options recognized as expense							22 months
Number of RSU's granted							111,652
Number of shares vested							93,017	111,790
Weighted Average fair value of option granted							$ 36.35	$ 27.53	$ 25.72
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units vesting period							2 years	2 years	2 years	2 years
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units vesting period							4 years	4 years	4 years	4 years
Restricted Stock Units (RSUs) [Member] \| Long Term Incentive Plan 2015-2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU's granted	105,102
Performance Stock Units 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested										91,190
Number of performance units, earned										309,890
Performance Stock Units 2012 [Member] \| Vesting Period 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested									86,170
Performance Stock Units 2012 [Member] \| Vesting Period 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested								131,488
Performance Stock Units 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested									9,821
Number of performance units, earned									33,405
Performance Stock Units 2013 [Member] \| Vesting Period 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested								13,373
Performance Stock Units 2013 [Member] \| Vesting Period 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested								8,701
Performance Stock Units 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested								49,248
Number of performance units, earned								123,788
Performance Stock Units 2014 [Member] \| Vesting Period 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested								32,074
Performance Stock Units 2014 [Member] \| Vesting Period 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested								38,356
Performance Stock Units 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested								69,912
Number of performance units, earned								231,543
Performance Stock Units 2015 [Member] \| Vesting Period 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested							84,007
Performance Stock Units 2015 [Member] \| Vesting Period 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested							68,682
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested compensation cost related to stock options							$ 3,093
Unvested compensation cost related to stock options recognized as expense							18 months
Number of performance units, earned							231,543
Weighted Average fair value of option granted							$ 36.62	$ 23.96	$ 25.43