Rhapsody Joint Venture (Summarized Financial Operating Information for Rhapsody) (Detail) - Rhapsody America LLC - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Net revenue	$ 52,769	$ 44,148	$ 149,156	$ 128,578
Gross profit	9,552	7,739	25,395	24,730
Net loss	$ (6,335)	$ (7,965)	$ (27,320)	$ (14,312)