Share-based Compensation - Summary of RSU's Granted Under LTIP (Detail) - 6 months ended Jun. 30, 2015 - 2015 Long-Term Incentive Program [Member] - $ / shares	Total
Awards with Market Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units	49,763
Weighted-Average Grant Date Fair Value	$ 29.86
Awards with Performance Condition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units	67,382
Weighted-Average Grant Date Fair Value	$ 22.05
Awards with Service Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units	196,272
Weighted-Average Grant Date Fair Value	$ 22.11

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).

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).

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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

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