INSTRUMENTS AND RISK MANAGEMENT - Additional Information (Detail)	12 Months Ended
Dec. 31, 2016	Oct. 31, 2013
Derivative [Line Items]
Derivative, Swaption Interest Rate		6.27%
Foreign Currency Derivatives, Maturity Period	1 year
Derivative Interest Rate Swap Agreement, Maturity Period	10 years

Maturity period of derivative interest rate swap agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cui_DerivativeInterestRateSwapAgreementMaturityPeriod
Namespace Prefix:	cui_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration