Stockholders' Equity (Deficit) - Summary of Estimated Earned Payout (Detail)	12 Months Ended
	Dec. 31, 2018
2018 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target level for performance goals measure, three year compound annual growth rate of net trade sales	100.00%
Estimated Payout on Adjusted EBITDA	100.00%
Estimated Payout on TSR	100.00%
Estimated Payout Combined	100.00%
2017 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target level for performance goals measure, three year compound annual growth rate of net trade sales	200.00%
Estimated Payout on Adjusted EBITDA	77.00%
Estimated Payout on TSR	100.00%
Estimated Payout Combined	125.00%
2016 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated Payout on Adjusted EBITDA	0.00%
Estimated Payout on TSR	0.00%
Estimated Payout Combined	0.00%