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Share-based Payment Arrangements - Summary of Information About USIE Option Plans (Detail) shares in Thousands | 12 Months Ended
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Dec. 31, 2019 shares $ / shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2017 shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Weighted average exercise price, Beginning balance | $ 58.1 |  |  |  |
Weighted average exercise price, Ending balance |  |  | $ 58.1 |  |
USIE option plans [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of options, beginning balance | shares | 16,711 | 16,711 | 25,556 | 25,556 | 25,933
Number of options, exercised | shares | (8,362) | (8,362) | (8,845) | (8,845) | (377)
Number of options, Ending balance | shares | 8,349 | 8,349 | 16,711 | 16,711 | 25,556
Number of options, exercisable, end of year | shares | 8,349 | 8,349 | 16,711 | 16,711 | 25,556
Weighted average exercise price, Beginning balance |  | $ 2.1 |  | $ 2.2 | $ 2.2
Weighted average exercise price, Options exercised |  | 2.0 |  | 2.2 | 1.9
Weighted average exercise price, Ending balance |  | 2.3 |  | 2.1 | 2.2
Weighted average exercise price, Options exercisable, end of year | $ 2.3 | $ 2.3 | $ 2.1 | $ 2.1 | $ 2.2

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