Age limit for participating in savings and retirement plan.

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- Definition

Deferred compensation arrangement with individual maximum contribution as percentage of cash bonus.

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- Definition

Deferred compensation arrangement with individual maximum contribution as percentage of retainer and meeting fees.

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- Definition

Distributions to senior executives commencement period after participant's separation from service.

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- Definition

Distributions to senior executives commencement period following individual attain age sixty five.

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- Definition

Effect of pending legal proceedings on company's consolidated financial position.

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- Definition

Minimum number of hours of employment in the plan year for discretionary matching contribution.

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- Definition

Minimum qualified service required to participate in the savings and retirement plan.

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Number of qualified deferred compensation plans.

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Percentage of cash compensation under deferred compensation plan.

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- Definition

Percentage of fixed return from deferred compensation plans.

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- Definition

Time period when distributions are paid subsequent to date individual becomes participant in plan.

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- Definition

Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Amount of cost for defined contribution plan.

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-Topic 715
-SubTopic 70
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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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No definition available.

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Percentage employer matches of the employee's percentage contribution matched.

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Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution 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.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) LegalMatter CompensationPlan	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Number of pending legal proceedings that would have an effect on consolidated financial position, results of operations, or cash flows \| LegalMatter	0
Total cash compensation under Deferred Compensation Plans	5.00%	5.00%	5.00%
Percentage of fixed return from Deferred Compensation Plans to participants	5.00%	5.00%	5.45%
Deferred Compensation Plans
Loss Contingencies [Line Items]
Employer discretionary matching contribution equal to employee's contribution	100.00%	100.00%	100.00%
Number of qualified deferred compensation plans \| CompensationPlan	2
Time period when distributions are paid, minimum years subsequent to the date an individual becomes a participant in the Plan	5 years
Distributions to senior executives commencement period, days after participant's separation from service	60 days
Distributions to senior executives commencement period following individual attains age sixty five	15 days
Matching contributions as general and administrative expense associated with the Deferred Compensation Plans	$ 0.3	$ 0.1	$ 0.2
Deferred Compensation Plans assets	14.0	13.5
Deferred Compensation Plans liability	$ 12.3	$ 11.0
Deferred Compensation Plans \| Executive Officer
Loss Contingencies [Line Items]
Contribution as percentage of salary	50.00%
Contribution as percentage of cash bonus	100.00%
Deferred Compensation Plans \| Non Employee Directors
Loss Contingencies [Line Items]
Contribution as percentage of retainer and meeting fees	100.00%
Deferred Compensation Plans \| After two years of service
Loss Contingencies [Line Items]
Vested percentage of employer contributions and investment earnings or losses	20.00%
Deferred Compensation Plans \| After three years of service
Loss Contingencies [Line Items]
Vested percentage of employer contributions and investment earnings or losses	40.00%
Deferred Compensation Plans \| After four years of service
Loss Contingencies [Line Items]
Vested percentage of employer contributions and investment earnings or losses	80.00%
Deferred Compensation Plans \| After five or more years of service
Loss Contingencies [Line Items]
Vested percentage of employer contributions and investment earnings or losses	100.00%
401(k) Savings and Retirement Plan (the "Plan")
Loss Contingencies [Line Items]
Minimum qualified service required to participate in the Savings and Retirement Plan, years	1 year
Eligible employee contribution on eligible compensation	90.00%
Employer discretionary matching contribution equal to employee's contribution	100.00%	100.00%	100.00%
Maximum percentage of employer discretionary matching contribution of employee's eligible compensation	5.00%	5.00%	5.00%
Minimum number of hours of employment in the plan year for discretionary matching contribution	one thousand
Discretionary contributions to the plan, net of forfeitures	$ 13.2	$ 12.3	$ 12.0
401(k) Savings and Retirement Plan (the "Plan") \| Minimum
Loss Contingencies [Line Items]
Age limit for participating in the Savings and Retirement Plan, years	18 years