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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

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount, before allocation of valuation allowances, of deferred tax asset attributable to deductible differences from reserves and accruals, compensation and benefit costs, and other provisions, reserves, and allowances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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