Net Capital Requirements - Additional Information (Detail) - United States [Member]	9 Months Ended
Sep. 27, 2019 USD ($)
Net Capital Requirements [Line Items]
Percentage of aggregate debit items arising from customer transactions to maintain minimum net capital requirements	2.00%
Minimum net capital requirements	$ 250,000

Minimum amount of net capital required to be maintained by broker-dealer subsidiary to engage in security transaction, calculated under Aggregate Indebtedness Standard.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

Name:	srt_MinimumNetCapitalRequiredForBrokerDealerSubsidiary1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant