Retirement Plans - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Age	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Compensation And Retirement Disclosure [Abstract]
Cash surrender value	$ 7.6		$ 8.1
Age for benefits \| Age		65
Life insurance death benefit claims received	$ 0.6
Defined contribution plan, cost recognized		$ 1.5	$ 1.8	$ 1.7

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant