Cover Page - shares	9 Months Ended
	Sep. 30, 2019	Nov. 01, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-33124
Entity Registrant Name	INNOPHOS HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-1380758
Entity Address, Address Line One	259 Prospect Plains Road
Entity Address, City or Town	Cranbury
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08512
City Area Code	609
Local Phone Number	495-2495
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	IPHS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		19,690,774
Entity Central Index Key	0001364099
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Shell Company	false