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Investments (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Investments in Topgolf, during the period |  |  | $ (282,000) | $ 0
Percentage of ownership interest in Topgolf |  | 14.00% | 14.00% |
Investment in Topgolf | $ 70,495,000 | $ 70,777,000 | $ 70,777,000 |
Topgolf International Inc |  |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Investments in Topgolf, during the period | (20,000,000) | 0 | (282,000) |
Investment in Topgolf | $ 70,495,000 | $ 70,777,000 | $ 70,777,000 |

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