Restructuring Liabilities - Summary of Changes in Restructuring Liabilities (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Balance at December 30, 2017	$ 5,335
Current period charges	1,165
Payments and usage—net of accretion	(3,873)
Balance at June 30, 2018	2,627
Severance and Related Costs
Restructuring Cost and Reserve [Line Items]
Balance at December 30, 2017	4,835
Current period charges	1,165
Payments and usage—net of accretion	(3,873)
Balance at June 30, 2018	2,127
Facility Closing Costs
Restructuring Cost and Reserve [Line Items]
Balance at December 30, 2017	500
Current period charges	0
Payments and usage—net of accretion	0
Balance at June 30, 2018	$ 500