Employee Benefit Plan (Detail) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Postemployment Benefits [Abstract]
Employer matching contribution, percent of employees' gross pay			1.00%
Employer matching contribution, amount for every employees' dollar contributed			$ 0.50
Employer matching contribution, percent of employees' gross pay for 50% matching for every dollar contributed			5.00%
Maximum annual contributions per employee, percent			3.50%
Award vesting service period			2 years
Matching contributions to the plan	$ 1,500,000	$ 1,400,000	$ 3,400,000	$ 3,000,000

Defined Contribution Plan, Employer Matching Contribution, Amount For Every Employees' Dollar Contributed

No definition available.

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- Definition

Defined Contribution Plan, Employer Matching Contribution, Percent Of Employees' Gross Pay For 50 Percent Matching For Every Dollar Contributed

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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- Definition

Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367

Reference 2: 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

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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