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Share-based Payments Arrangement - SENAO's Employee Stock Options Outstanding (Detail) - Senao International Co., Ltd. (SENAO) [Member] | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 $ / shares | Dec. 31, 2019 $ / shares | Jul. 31, 2018 $ / shares | Jun. 30, 2018 $ / shares | Dec. 31, 2017 $ / shares | Jul. 31, 2017 $ / shares | Jun. 30, 2017 $ / shares | Dec. 31, 2016 $ / shares
Disclosure of range of exercise prices of outstanding share options [Line Items] |  |  |  |  |  |  |  |
Range of Exercise Price | $ 66.20 | $ 66.20 | $ 66.20 | $ 70.70 |  | $ 70.70 | $ 76.10 |
Number of Options Outstanding | 5,318,000 | 0 |  |  | 5,926,000 |  |  | 6,587,000
Weighted-average Remaining Contractual Life (Years) | 4 months 6 days |  |  |  |  |  |  |
Weighted-average Exercise Price | $ 66.20 | $ 0 |  |  | $ 70.70 |  |  | $ 76.10
Options Exercisable Number of Options | 5,318,000 | 0 |  |  | 5,926,000 |  |  |
Option Exercisable Weighted-average Exercise Price | $ 66.20 | $ 0 |  |  | $ 70.70 |  |  |

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