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Summary of Impact of Adoption of ASC 606 on Balance Sheet (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 02, 2018 | Jan. 01, 2018
Revenue Recognition [Line Items] |  |  |
Cumulative effect of accounting change adjustment net of taxes, in retained earnings |  | $ 40,526 |
NCM | Adoption of ASC Topic 606 |  |  |
Revenue Recognition [Line Items] |  |  |
Cumulative effect of accounting change adjustment net of taxes, in retained earnings |  |  | $ 53,605
Impact of change in amortization method | $ 4,104 |  |

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