Stockholders' Equity (Deficit) - PSU Awards (Detail)		12 Months Ended
	May 18, 2017	Dec. 31, 2018	Dec. 31, 2017
Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years
Three-year PSU Awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued as percentage of target shares under performance incentive plan		0.00%
Three-year PSU Awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares to be issued as percentage of target shares under performance incentive plan		200.00%
2016 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Weighted average return on total shareholders		50.00%
Target level for the determination of performance goals and measures for adjusted EBITDA goal		50.00%
2017 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Weighted average return on total shareholders			34.00%
Target level for the determination of performance goals and measures for adjusted EBITDA goal			33.00%
Compound annual growth rate of net trade sales			33.00%
2018 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average return on total shareholders		34.00%
Target level for the determination of performance goals and measures for adjusted EBITDA goal		50.00%
Compound annual growth rate of net trade sales		33.00%
PSUs – Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years