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Share-Based Compensation and Benefit Plans (Profit Sharing and Savings Plan) (Narrative) (Detail) - Profit sharing and savings plan [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-Based Compensation and Benefit Plans |  |  |
Profit sharing and savings plan, employer discretionary contribution | $ 0.0 | $ 0.0 | $ 0.0
Profit sharing and savings plan, cost recognized | $ 27.5 | $ 24.8 | $ 22.6
Employee's first 2% of contributed wages [Member] |  |  |
Share-Based Compensation and Benefit Plans |  |  |
Profit sharing and savings plan, Company match | 100.00% |  |
Employee's next 4% of contributed wages [Member] |  |  |
Share-Based Compensation and Benefit Plans |  |  |
Profit sharing and savings plan, Company match | 25.00% |  |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Period Type: | duration

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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. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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- Details
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- Details
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