Business Acquisitions and Investments - Additional Information (Detail) - USD ($)				3 Months Ended												12 Months Ended
	Aug. 31, 2018	Oct. 26, 2017	Jan. 06, 2017	Dec. 29, 2018		Sep. 29, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 27, 2017
Business Acquisition [Line Items]
Business acquisition, goodwill				$ 72,606,000								$ 65,999,000				$ 72,606,000	$ 65,999,000	$ 28,146,000
Net sales				$ 260,341,000	[1]	$ 247,954,000		$ 238,147,000		$ 227,262,000		$ 227,719,000	$ 224,615,000	$ 229,262,000	$ 221,625,000	973,705,000	$ 903,221,000	$ 859,604,000
Equity Method Investee [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage																			33.00%
Equity method investment, cost																			$ 10,000,000
Minimum [Member]
Business Acquisition [Line Items]
Cash flows discounted at rates		15.00%
Maximum [Member]
Business Acquisition [Line Items]
Cash flows discounted at rates		17.00%
Flight Systems Automotive Group LLC [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of outstanding stock acquired	100.00%
Business acquisition, cash paid	$ 27,500,000
Business acquisition, goodwill	5,500,000
Business acquisition, identified intangibles	5,310,000
Business acquisition, other net assets	16,700,000
Business acquisition, accounts receivables	2,000,000
Business acquisition, inventory	9,100,000
Business acquisition, fixed assets	4,400,000
Business acquisition, other assets and liabilities net	1,200,000
Net sales	$ 7,800,000
MAS Automotive Distribution Inc [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of outstanding stock acquired		100.00%
Business acquisition, goodwill		$ 35,431,000
Business acquisition, identified intangibles		20,440,000
Business acquisition, fixed assets		1,615,000
Business acquisition, total purchase price consideration		67,223,000
Business acquisition, cash acquired		3,300,000
Net sales, included in consolidated statement of operations																40,300,000
Estimated contingent payments		7,982,000														7,900,000
Business combination maximum contingent consideration payment		$ 11,700,000
Business combination sales thresholds achievement maturity date		2020-12
Payment to former shareholder																1,500,000
MAS Automotive Distribution Inc [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Estimated contingent payments																$ 300,000
Ingalls Engineering Company, Inc., [Member]
Business Acquisition [Line Items]
Business acquisition, cash paid			$ 3,100,000
Business acquisition, other net assets			2,000,000
Business acquisition, total purchase price consideration			$ 4,800,000
Business acquisition date			Jan. 06, 2017
Business acquisition, estimated contingent payments			$ 1,700,000
Business acquisition of goodwill and other intangible assets			$ 2,800,000

[1] Quarterly information does not add to year to date information due to rounding