Defined contribution plan employer matching contribution vesting period.

No definition available.

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- Definition

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(b))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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- 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

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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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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- Details

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Defined Contribution Benefit Plans - Additional Information (Detail) - USD ($)	8 Months Ended	12 Months Ended
	Sep. 09, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Rabbi trust assets		$ 900,000	$ 100,000
Savings 401(k) Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer-matching contribution		50.00%		50.00%
Employees contribution percentage basis for employer matching contribution (as a percent)		6.00%		6.00%
Employees initial service period		3 years		5 years
Annual deferral limit		$ 18,000	18,000	$ 18,000
Amount of Employer contributions during period		$ 1,700,000	$ 2,700,000	$ 1,700,000
Savings 401(k) Plan [Member] \| Share-based Compensation Award, Tranche One [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer-matching contribution	100.00%	100.00%
Employees contribution percentage basis for employer matching contribution (as a percent)	3.00%
Savings 401(k) Plan [Member] \| Share-based Compensation Award, Tranche Two [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer-matching contribution	50.00%
Employees contribution percentage basis for employer matching contribution (as a percent)	2.00%
Non-Qualified Deferred Compensation Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer-matching contribution		50.00%
Employees contribution percentage basis for employer matching contribution (as a percent)		6.00%
Employees initial service period		3 years