Employee Benefit Plans - Schedule of Fair Value of Separate Accounts by Assets Category (Details) - Pension Plan - USD ($) $ in Thousands	Dec. 31, 2022	Jul. 25, 2022	Jul. 24, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 56,737	$ 63,627	$ 63,627	$ 98,954	$ 94,215
Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	29,421			45,445
Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	27,316			53,509
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	27			20
Cash and cash equivalents \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	27			20
Cash and cash equivalents \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0			0
Growth funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,271			6,649
Growth funds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,271			6,649
Growth funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0			0
Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1,395			2,072
Real estate funds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1,395			2,072
Real estate funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0			0
Equity income funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,217			6,197
Equity income funds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,217			6,197
Equity income funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0			0
Index funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9,036			12,642
Index funds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9,036			12,642
Index funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0			0
International equity funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3,795			4,883
International equity funds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3,795			4,883
International equity funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0			0
Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	33,996			66,491
Fixed income funds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	6,680			12,982
Fixed income funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 27,316			$ 53,509

Cornerstone Building Brands, Inc. 10-K