Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
	Jan. 01, 2017	Sep. 28, 2018	Sep. 29, 2017	Mar. 31, 2017	Sep. 28, 2018	Sep. 29, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective income tax rate		(12.60%)	10.90%		(13.20%)	2.20%
Federal statutory income tax rate					21.00%	35.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount				$ 1,200
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount			$ 2,400
Unrecognized Tax Benefits		$ 17,600			$ 17,600
Unrecognized tax benefits that would impact the provision for income taxes		4,800			4,800
Interest and possible penalties related to uncertain tax positions		500			500
Decrease in Unrecognized Tax Benefits is Reasonably Possible					1,500
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations					300
Accumulated deficit		$ (2,070,746)			$ (2,070,746)		$ (2,057,812)
Accounting Standards Update 2016-09 [Member]
Income Tax Contingency [Line Items]
Accumulated deficit	$ 0
Accounting Standards Update 2016-09 [Member] | SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Income Tax Contingency [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	4,600
Accounting Standards Update 2016-09 [Member] | Deferred Tax Assets Gross
Income Tax Contingency [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	4,600
Accounting Standards Update 2016-16 [Member]
Income Tax Contingency [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax	$ 1,400
Deferred Tax Assets, Net				1,100
Deferred Tax Assets, Valuation Allowance				2,100
Deferred Tax Assets, Tax Deferred Expense				$ 300