Debt - Monoprice 2013 Credit Facility - Additional Information (Detail) (Monoprice, Inc, USD $)	0 Months Ended	9 Months Ended
	Nov. 22, 2013	Sep. 30, 2014	Dec. 31, 2013	Nov. 22, 2013
Debt Instrument [Line Items]
Agreement date	Nov. 22, 2013
Credit facility				$ 70,000,000.0
Maturity date of credit facility	Nov. 22, 2018
Principal amount			50,000,000.0
Minimum credit facility aggregate principal amount due	1,000,000.0
Debt paid		6,000,000
Interest rate description	The interest rate on amounts borrowed under the credit facility is variable, based upon, at the election of Monoprice, either LIBOR plus a margin of between 2.75% and 3.25%, payable as of the end of each interest period, or a variable rate plus a margin of between 1.75% and 2.25%, payable quarterly in arrears. In each case, the applicable margin within the range depends upon Monoprice’s ratio of leverage to EBITDA over the previous four quarters.
Revolver Under Credit Facility
Debt Instrument [Line Items]
Credit facility	30,000,000.0			30,000,000.0
Letter of Credit
Debt Instrument [Line Items]
Credit facility	5,000,000.0			5,000,000.0
Term Loan
Debt Instrument [Line Items]
Credit facility	40,000,000.0			40,000,000.0
Swing Line Loans
Debt Instrument [Line Items]
Credit facility				5,000,000.0
Minimum credit facility aggregate principal amount due	$ 100,000.0
Minimum
Debt Instrument [Line Items]
Variable interest rate	1.75%
Minimum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable interest rate	2.75%
Maximum
Debt Instrument [Line Items]
Variable interest rate	2.25%
Maximum | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable interest rate	3.25%