Common Shares and Net Income (Loss) per Common Share - Anti-dilutive Securities Excluded from the Computation (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 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)	5,378	914
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)	1,252	627
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)	374	90