Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Valuation allowance	$ 32,032	$ 12,846
Additional valuation allowance recorded against federal tax credits	19,200
Operating loss carryforwards	17,301	40,969
Provisional tax expense	5,600
Remeasurement of U.S. deferred taxes	13,500
Accumulated undistributed earnings generated by foreign subsidiaries	70,700
Withholding tax accrual on estimated cash remitted	300
Unrecognized tax benefits	33,506	30,088	$ 3,071	$ 2,734
Unrecognized tax benefits that would impact the effective income tax rate	22,200	23,800
Interest and tax penalties related to unrecognized tax benefits	600	$ 500
Federal
Income Tax Contingency [Line Items]
Operating loss carryforwards	32,700
State
Income Tax Contingency [Line Items]
Operating loss carryforwards	95,400
Foreign
Income Tax Contingency [Line Items]
Tax credit carryforward	19,800
Research Tax Credit Carryforward | State
Income Tax Contingency [Line Items]
Tax credit carryforward	14,500
Research Tax Credit Carryforward | Foreign
Income Tax Contingency [Line Items]
Tax credit carryforward	600
DTS Inc. & Subsidiaries And Ziptronix Inc. | Research Tax Credit Carryforward | Federal
Income Tax Contingency [Line Items]
Tax credit carryforward	10,000
Federal Tax Credits and Remeasurement
Income Tax Contingency [Line Items]
Additional valuation allowance recorded against federal tax credits	13,500
Remeasurement of U.S. deferred taxes	$ 7,900