Acquisition and Investment - Additional Information - Lift Ventures, LLC (Detail) - USD ($) $ in Thousands |
Dec. 16, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|
| Business Acquisition [Line Items] | |||
| Carrying value of Lift Venture JV | $ 5,752 | ||
| Lift Ventures LLC [Member] | |||
| Business Acquisition [Line Items] | |||
| Unconsolidated equity investment ownership percentage | 25.00% | ||
| Carrying value of Lift Venture JV | $ 5,752 | ||
| Lift Ventures LLC [Member] | Inventory [Member] | |||
| Business Acquisition [Line Items] | |||
| Equity method investment contribution to inventory | $ 5,951 | ||
| Equity Method Investee [Member] | Lift Ventures LLC [Member] | |||
| Business Acquisition [Line Items] | |||
| Unconsolidated equity investment ownership percentage | 25.00% |