Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax expense
Federal									$ 474	$ 2,387	$ 5,953
State									1,260	525	2,982
Current Income Tax Expense (Benefit), Total									1,734	2,912	8,935
Deferred tax (benefit) expense
Federal									(789)	(15,515)	3,876
State									291	135	41
Deferred Income Tax (Benefit) Expense, Total									(498)	(15,380)	3,917
Income tax expense (benefit)	$ 1,118	$ 119	$ 242	$ (243)	$ (14,541)	$ 940	$ 741	$ 392	$ 1,236	$ (12,468)	$ 12,852