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.

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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).

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

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Share-Based Compensation - Additional Information (Detail) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	May 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted	2,973	2,956
Issuance of shares under stock purchase plan	703	699
Stock Option Plan 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share authorized for grant			3,000
Directors' Restricted Stock Plan 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share granted to independent directors	41	34
Upper end \| Stock Option Plan 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Upper end \| Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years