Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Taxes [Line Items]
Income tax expense from reversal of intra-period income tax allocation				$ 1,600,000
Operating loss carryforwards			$ 1,900,000	3,800,000
Operating loss carryforwards, expiration date		2027
Excess tax benefit			1,872,000	$ 3,840,000
Valuation allowance		$ 0	$ 0
Statutory federal income tax rate		35.00%	35.00%	35.00%
Tax benefit due to tax rate change		$ 12,400,000
Scenario, Plan [Member]
Income Taxes [Line Items]
Statutory federal income tax rate	21.00%
ASU 2016-09 [Member]
Income Taxes [Line Items]
Excess tax benefit		$ 1,800,000
North Carolina [Member]
Income Taxes [Line Items]
Valuation allowance against net operating losses				$ 200,000
Net operating losses carryforward			$ 100,000
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Open tax years for examination		2011
Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Open tax years for examination		2017
CGI [Member]
Income Taxes [Line Items]
Goodwill deductible for tax purpose		$ 9,300,000
Deferred tax asset and liability		0
Unamortized goodwill		$ 5,200,000	6,500,000
Goodwill remaining amortization period for tax purposes		7 years 4 months 24 days
WinDoor [Member]
Income Taxes [Line Items]
Goodwill deductible for tax purpose		$ 38,900,000	38,900,000
Unamortized goodwill		33,900,000	36,500,000
Business combination, acquisition related costs			900,000
US Impact Systems Inc. [Member]
Income Taxes [Line Items]
Goodwill deductible for tax purpose		600,000
Unamortized goodwill		500,000	$ 600,000
State [Member]
Income Taxes [Line Items]
Operating loss carryforwards		$ 1,000,000