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Share-Based Payment Awards - Deferred Stock Units - Additional Information (Detail) - shares	1 Months Ended	12 Months Ended
	Jan. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
2016 Long Term Incentive Plan [Member]
Class of Stock [Line Items]
Ratable annual vesting period of equity awards	4 years
Non Executive Directors [Member]
Class of Stock [Line Items]
Non-vested deferred stock units outstanding		0	35,418
Deferred Stock Units [Member]
Class of Stock [Line Items]
Non-vested deferred stock units outstanding			35,418
Ratable annual vesting period of equity awards		1 year
Deferred Stock Units [Member] | 2016 Long Term Incentive Plan [Member]
Class of Stock [Line Items]
Vested deferred stock units vested		71,251

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested at balance sheet date.

+ References

No definition available.

+ Details

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X

- 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.

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X

- 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

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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 (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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