Performance-Based Common Stock Warrants - Fair Value Assumptions (Details) - Performance-based warrants - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Class of Warrant or Right [Line Items]
Fair value (in dollars per share)	$ 19.49	$ 30.88
Price of Universal Electronics Inc. common stock (in dollars per share)	$ 55.61	$ 65.78
Risk-free interest rate	2.06%	2.09%
Expected volatility	34.30%	39.30%
Expected life in years	5 years 2 months 1 day	6 years