Stockholders' Equity - PSU Awards (Detail)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target level for the determination of performance goals and measures	100.00%
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%
2015 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average return on total shareholders	35.00%	50.00%
Target level for the determination of performance goals and measures for adjusted EBITDA goal	65.00%	50.00%
2016 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	65.00%
2017 Three-year PSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target level for the determination of performance goals and measures for adjusted EBITDA goal	33.00%
Target Level For Performance Goals Measure Achieved, three Year Compound Annual Growth Rate Of Net Trade Sales	33.00%
Target level for performance goals measure, three year compound annual growth rate of net trade sales	100.00%
PSUs – Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Target level for the determination of performance goals and measures	100.00%

Percentage of weighted average return on capital.

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Shares to be issued as a percentage of target shares under the performance incentive plan.

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Target level for the determination of performance goals and measures for EBITDA goal.

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Target Level For Performance Goals Measure Achieved, three Year Compound Annual Growth Rate Of Net Trade Sales

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Target Level For Performance Goals Measure, three Year Compound Annual Growth Rate Of Net Trade Sales

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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