Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

+ References

No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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Stock-Based Compensation - Additional Information (Detail) - $ / shares	1 Months Ended					6 Months Ended		12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, granted (in shares)						0	0
Long Term Incentive Plan 2014-2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, granted (in shares)				380,064
Long-Term Incentive Plan 2013- 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, granted (in shares)					330,639
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU's granted (in shares)						94,707
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 \| 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
Service period for award eligibility (at least)						6 months
Weighted average fair values of RSU's granted (in dollars per share)						$ 38.73		$ 36.02
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
Units Vesting 2014 \| Stock options \| Long-Term Incentive Plan 2013- 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2015 \| Stock options \| Long Term Incentive Plan 2014-2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2015 \| Stock options \| Long-Term Incentive Plan 2013- 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2016 \| Stock options \| Long Term Incentive Plan 2014-2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2016 \| Stock options \| Long-Term Incentive Plan 2013- 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2016 \| Restricted stock units \| Long Term Incentive Plan 2015-2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2017 \| Stock options \| Long Term Incentive Plan 2014-2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2017 \| Restricted stock units \| Long Term Incentive Plan 2016-2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2017 \| Restricted stock units \| Long Term Incentive Plan 2015-2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2018 \| Restricted stock units \| Long-Term Incentive Plan 2017-2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2018 \| Restricted stock units \| Long Term Incentive Plan 2016-2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2018 \| Restricted stock units \| Long Term Incentive Plan 2015-2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2019 \| Restricted stock units \| Long-Term Incentive Plan 2017-2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2019 \| Restricted stock units \| Long Term Incentive Plan 2016-2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%
Units Vesting 2020 \| Restricted stock units \| Long-Term Incentive Plan 2017-2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Yearly vesting percentage of equity awards (as a percent)						33.33%