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.

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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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

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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Stock-Based Compensation - Additional Information (Detail) - $ / shares	1 Months Ended				3 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option long term incentive plan granted vesting portion per year					One-third each year
Stock options, granted					0	0
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
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU's granted					106,287
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
Weighted average fair values of RSU's granted						$ 36.78
Restricted Stock Units (RSUs) [Member] \| Long Term Incentive Plan 2016-2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU's granted	106,287
Weighted average fair values of RSU's granted					$ 36.76