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Discontinued operations - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |
Pretax gain/ (loss) on disposal of discontinued operations | $ 41,095
Discontinued Operations, Disposed of [Member] | Advertising Business [Member] |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |
Assets and liabilities disposed value | 0
Pretax gain/ (loss) on disposal of discontinued operations | $ 41,095

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