Discontinued Operations- Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Nov. 22, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility borrowed	$ 607,650,000	$ 253,190,000
Unamortized discount	(24,207,000)	(16,073,000)
Net carrying value	$ 571,399,000	233,003,000
Monoprice Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility payment terms	Monoprice has the right to permanently reduce, without premium or penalty, the entire credit facility at any time or portions of the credit facility in an aggregate principal amount not less than $1.0 million or any whole multiple of $1.0 million in excess thereof (for swingline loans, the aggregate principal amount is not less than $0.1 million and any whole multiple of $0.1 million in excess thereof).
Credit facility, interest rate description	The interest rate is variable, based upon, at the election of Monoprice, either LIBOR plus a margin of between 2.75% and 3.25%, payable each interest period, or a variable rate plus a margin of between 1.75% and 2.25%, payable quarterly. In each case, the applicable margin within the range depends upon Monoprice’s ratio of leverage to EBITDA over the previous four quarters.
Credit facility borrowed	$ 25,000,000	42,000,000	$ 50,000,000.0
Unamortized discount	0	(191,000)
Net carrying value	$ 25,000,000	41,809,000
Agreement date	Nov. 22, 2013
Final maturity date of credit facility	Nov. 22, 2018
Principal repayments	$ (17,000,000)	$ (8,000,000)
Periodic payment, principal	1,000,000.0
Periodic payment, principle multiple	1,000,000.0
Monoprice Credit Facility [Member] | Revolving credit facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility			30,000,000.0
Monoprice Credit Facility [Member] | Letter of credit [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility			5,000,000.0
Monoprice Credit Facility [Member] | Swingline loans [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility			5,000,000.0
Periodic payment, principal	100,000.0
Periodic payment, principle multiple	$ 100,000.0
Monoprice Credit Facility [Member] | Term loan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility			$ 40,000,000.0
Minimum [Member] | Monoprice Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility, variable interest rate	1.75%
Maximum [Member] | Monoprice Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility, variable interest rate	2.25%
LIBOR Rate [Member] | Minimum [Member] | Monoprice Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility, variable interest rate	2.75%
LIBOR Rate [Member] | Maximum [Member] | Monoprice Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Credit facility, variable interest rate	3.25%