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Business Combinations - Summary of Assets Acquired and Liabilities Assumed are Recorded at Their Fair Values as of Acquisition Date (Detail) (USD $) In Thousands, unless otherwise specified			0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Aug. 22, 2013 Monoprice, Inc	Aug. 22, 2013 Monoprice, Inc	Aug. 22, 2013 Monoprice, Inc Customer relationships	Aug. 22, 2013 Monoprice, Inc Trade name
Business Acquisition [Line Items]
Tangible assets acquired				$ 49,714
Liabilities assumed				(23,623)
Identifiable net assets acquired				26,091
Fair value adjustments to intangible assets:
Fair value of intangible assets acquired				68,900	30,900	38,000
Cash paid			182,909
Less identifiable net assets acquired				(26,091)
Plus deferred tax liability related to intangible assets				27,683
Less fair value of intangible assets acquired				(68,900)	(30,900)	(38,000)
Excess of purchase price over net assets acquired, allocated to goodwill	$ 364,054	$ 348,957		$ 115,601