Business Combinations - Pro-Forma Adjustments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Estimated increase in combined amortization and depreciation expense due to acquired intangible assets and property and equipment measured at fair value	$ 7,200	$ 2,300	$ 1,600
Estimated increase in combined stock-based compensation expense due to assumed DTS equity awards measured at fair value	33,462	21,101	11,517
Estimated increase in combined interest and other expense, net due to estimated increase in interest expense (and amortization of debt issuance costs) from new debt obtained to finance the Transaction and estimated lower interest income from lower investment holdings	$ 28,292	2,409	$ 0
DTS Merger
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Weighted average statutory tax rate used for tax effects on pro forma adjustments	23.00%
DTS Merger | Acquisition-related costs | Pro Forma
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Estimated increase in combined amortization and depreciation expense due to acquired intangible assets and property and equipment measured at fair value	$ 59,092	75,975
Estimated increase in combined stock-based compensation expense due to assumed DTS equity awards measured at fair value	4,781	6,888
Estimated increase in combined interest and other expense, net due to estimated increase in interest expense (and amortization of debt issuance costs) from new debt obtained to finance the Transaction and estimated lower interest income from lower investment holdings	24,806	28,964
Elimination of Tessera and DTS non-recurring transaction costs reflected in historical results	(27,900)	0
Estimated increase (decrease) to combined expense for non-recurring employee-related costs resulting from the acquisition, including severance and retention bonus expense	$ (3,436)	$ 21,100