Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Oct. 28, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Registrant Name	Installed Building Products, Inc.
Entity Central Index Key	0001580905
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	IBP
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		29,800,535
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-36307
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-3707650
Entity Address, Address Line One	495 South High Street
Entity Address, Address Line Two	Suite 50
Entity Address, City or Town	Columbus
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	43215
City Area Code	614
Local Phone Number	221-3399
Title of 12(b) Security	Common stock
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Security Exchange Name	NYSE
Entity Shell Company	false