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Commitments and Contingencies - Lifecell - Additional Information (Detail) - Lifecell [member] | 12 Months Ended
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Dec. 31, 2017 License
Disclosure of commitments and contingencies [Line Items] |
License agreement term | 15 years
Number of license owned | 12
International and Long Distance [member] |
Disclosure of commitments and contingencies [Line Items] |
Number of license issued | 1
Ukraine [member] |
Disclosure of commitments and contingencies [Line Items] |
Number of license issued | 8

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