Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2017	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017	Dec. 31, 2017	Mar. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits		$ 17,900		$ 17,900
Effective income tax rate		(44.10%)	(1.90%)	(13.50%)	(0.60%)
Federal statutory income tax rate				21.00%
Unrecognized tax benefits that would impact the provision for income taxes		$ 1,100		$ 1,100
Interest and possible penalties related to uncertain tax positions		500		500
Decrease in Unrecognized Tax Benefits is Reasonably Possible		1,500		1,500
Accumulated deficit		$ (2,062,988)		$ (2,062,988)		$ (2,057,812)
Accounting Standards Update 2016-09 [Member]
Income Tax Contingency [Line Items]
Accumulated deficit	$ 0
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 2016-09 [Member] | Valuation Allowance of Deferred Tax Assets
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