Common Shares and Net Income (Loss) per Common Share - Anti-dilutive Securities Excluded from the Computation (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted income (loss) per common share (in shares)	2,164	653	5,435	1,143
Performance-based RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted income (loss) per common share (in shares)	568	766	1,254	766
Time-based RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted income (loss) per common share (in shares)	2	0	365	0