Common Shares and Net Income (Loss) per Common Share - Anti-dilutive Securities Excluded from the Computation (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 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)	2,202	1,141	5,473	1,086
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)	527	327	1,215	327
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)	3	0	358	0