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Stock-Based Compensation - Additional Information (Detail) - $ / shares shares in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2019 | Jan. 31, 2018 | Jun. 30, 2019 | Jul. 01, 2018 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Estimated annual dividend amount per share |  |  | $ 0.36 | $ 0.36 |
Stock price | $ 37.95 |  |  |  | $ 47.70
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Period of stock granted to employees and executive officers vest in equal annual installments |  |  | 4 years |  |
Percentage of common stock price paid |  |  | 100.00% |  |
Stock options term |  |  | 7 years |  |
Restricted Stock Units | Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Period of stock granted to employees and executive officers vest in equal annual installments |  |  | 4 years |  |
Restricted Stock Units | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Period of stock granted to employees and executive officers vest in equal annual installments |  |  | 1 year |  |
Percentage of awards vesting on the first anniversary of grant date |  |  | 100.00% |  |
TSR Performance-Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Total shareholder return performance measurement period |  | 3 years |  |  |
Minimum age of retirement to be eligible for PRSUs |  |  | 60 years |  |
Minimum years of service for retirement to be eligible for PRSUs |  |  | 10 years |  |
Restricted stock unit awards granted |  |  | 0.1 | 0.1 |
Weighted average grant date fair value of restricted stock units granted |  |  | $ 51.51 | $ 54.85 |
Stock price | $ 37.95 |  |  |  | $ 47.70
TSR Performance-Based Restricted Stock Units | Measurement Input, Expected Dividend Payment [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Estimated annual dividend amount per share |  |  | $ 0.36 | $ 0.36 |
TSR Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of vesting of target shares upon performance achieved | 200.00% |  |  |  |
TSR Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of vesting of target shares upon performance achieved | 0.00% |  |  |  |
PBIT Performance-Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Total shareholder return performance measurement period | 3 years |  |  |  |
Restricted stock unit awards granted |  |  | 0.1 | 0.1 |
Weighted average grant date fair value of restricted stock units granted |  |  | $ 36.88 | $ 46.62 |
PBIT Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of vesting of target shares upon performance achieved |  | 200.00% |  |  |
PBIT Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of vesting of target shares upon performance achieved |  | 0.00% |  |  |
Service-Based Restricted Stock Units | Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Restricted stock unit awards granted |  |  | 0.7 | 0.6 |
Weighted average grant date fair value of restricted stock units granted |  |  | $ 36.10 |  |
Weighted average grant date fair value of restricted stock units granted |  |  |  | $ 46.38 |
Service-Based Restricted Stock Units | Executive Officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Restricted stock unit awards granted |  |  |  | 0.1 |
Weighted average grant date fair value of restricted stock units granted |  |  |  | $ 12.17 |
Service-Based Restricted Stock Units | Non Employee Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Restricted stock unit awards granted |  |  | 0.1 | 0.1 |
Weighted average grant date fair value of restricted stock units granted |  |  | $ 48.03 | $ 35.81 |
Service Based Stock Options | Executive Officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Weighted average grant date fair value of restricted stock units granted |  |  | $ 10.61 |  |
Number options granted during the period |  |  | 0.1 |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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