Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount

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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 Compensation Arrangement by Share Based Payment Award, Non-Option Equity Instruments, Outstanding Vested Awards, Number

+ 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=96867065&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

The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions.

+ References

No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&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=96867065&loc=d3e5070-113901

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- 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)
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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=96867065&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=96867065&loc=d3e5070-113901

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- Definition

Percentage of vesting of 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Period from grant date that an equity-based award expires, 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
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-URI http://asc.fasb.org/extlink&oid=96867065&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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended						12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)								0	0	0
Granted (in dollars per share)								$ 0.00	$ 0.00
Weighted average remaining contractual life of options outstanding								4 years 9 months 18 days
Shares available for future issuance under equity compensation plans								2,332,604
Excess tax benefits on stock-based compensation									$ 274	$ 4,323
Excess tax benefit from stock-based compensation								$ 1,877
Long-Term Incentive Plan 2012- 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)						589,934
Long-Term Incentive Plan 2013- 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)					330,639
Long Term Incentive Plan 2014-2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)				380,064
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)										$ 0.00
Stock options \| Incentive Compensation Plans 2001, 2006, 2010, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)								10 years
Stock options \| Vesting Period One \| Long-Term Incentive Plan 2012- 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)						33.33%
Stock options \| Vesting Period One \| Long-Term Incentive Plan 2013- 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)					33.33%
Stock options \| Vesting Period One \| Long Term Incentive Plan 2014-2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)				33.33%
Stock options \| Vesting Period Two \| Long-Term Incentive Plan 2012- 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)						33.33%
Stock options \| Vesting Period Two \| Long-Term Incentive Plan 2013- 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)					33.33%
Stock options \| Vesting Period Two \| Long Term Incentive Plan 2014-2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)				33.33%
Stock options \| Vesting Period Three \| Long-Term Incentive Plan 2012- 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)						33.33%
Stock options \| Vesting Period Three \| Long-Term Incentive Plan 2013- 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)					33.33%
Stock options \| Vesting Period Three \| Long Term Incentive Plan 2014-2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)				33.33%
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)								$ 38.33	$ 36.02	36.35
Number of RSU's granted (in shares)								103,207
Vested restricted stock units (in shares)								2,499	93,440
Equity awards vested (in shares)								157,344
Unvested compensation cost								$ 2,021
Unvested compensation cost period of recognition								24 months
Restricted stock units \| Long Term Incentive Plan 2015-2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU's granted (in shares)			105,102
Restricted stock units \| Long Term Incentive Plan 2016 - 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU's granted (in shares)		106,287
Restricted stock units \| Long Term Incentive Plan 2017 - 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU's granted (in shares)	82,563
Restricted stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)								3 years
Restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)								4 years
Restricted stock units \| Vesting Period One \| Long Term Incentive Plan 2015-2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)			33.33%
Restricted stock units \| Vesting Period One \| Long Term Incentive Plan 2016 - 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)		33.33%
Restricted stock units \| Vesting Period One \| Long Term Incentive Plan 2017 - 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)	33.33%
Restricted stock units \| Vesting Period Two \| Long Term Incentive Plan 2015-2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)			33.33%
Restricted stock units \| Vesting Period Two \| Long Term Incentive Plan 2016 - 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)		33.33%
Restricted stock units \| Vesting Period Two \| Long Term Incentive Plan 2017 - 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)	33.33%
Restricted stock units \| Vesting Period Three \| Long Term Incentive Plan 2015-2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)			33.33%
Restricted stock units \| Vesting Period Three \| Long Term Incentive Plan 2016 - 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)		33.33%
Restricted stock units \| Vesting Period Three \| Long Term Incentive Plan 2017 - 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (as a percent)	33.33%
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)								$ 38.23	$ 36.76	$ 36.62
Equity awards vested (in shares)								114,569
Unvested compensation cost								$ 221
Unvested compensation cost period of recognition								12 months
Performance stock units \| Long-Term Incentive Plan 2013- 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards vested (in shares)										8,701	13,373	9,821
Number of performance units, earned (in shares)												33,405
Performance stock units \| Long Term Incentive Plan 2014-2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards vested (in shares)									38,091	32,074	49,248
Number of performance units, earned (in shares)											123,788
Performance stock units \| Long Term Incentive Plan 2015-2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards vested (in shares)								66,909	83,371	69,912
Number of performance units, earned (in shares)										231,543
Performance stock units \| Long Term Incentive Plan 2016 - 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards vested (in shares)								45,435	55,570
Number of performance units, earned (in shares)									179,865
Performance stock units \| Long Term Incentive Plan 2016 - 2018 \| Scenario, Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards vested (in shares)							48,459
Performance stock units \| Long Term Incentive Plan 2017 - 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance units, earned (in shares)								0