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Summary of Significant Accounting Policies - Schedule of Deferred Revenue and Customer Advances by Arrangement (Parenthetical) (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Change in Contract with Customer, Liability [Line Items] |  |  |
Deferred revenue and customer advances |  | $ 14,246 | $ 26,194
Long-term deferred revenue | $ 3,126 | 3,228 |
Deferred revenue and customer advances recognized in income |  | 83,497 |
Deferred Revenue [Member] |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |
Deferred revenue and customer advances | 12,842 | 14,246 |
Customer Advances [Member] |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |
Deferred revenue and customer advances | 13,352 | 6,112 |
ASC 606 [Member] |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |
Adjustment in deferred revenue and customer advances | $ (1,520) |  |
Deferred revenue and customer advances recognized in income |  | $ 61,012 |

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