Amount of capital expenditure attributable to discontinued operations.

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Discontinued Operations (Detail) $ in Thousands, € in Millions, £ in Millions		6 Months Ended	12 Months Ended
	Jul. 05, 2016 USD ($)	Jul. 05, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jul. 05, 2016 EUR (€)	Jul. 05, 2016 GBP (£)	Jul. 05, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations, net of tax			$ 0	$ 0	$ 2,351
Digital Realty
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, including discontinued operation, consideration						€ 304.6	£ 376.2	$ 827,300
Telecity Group plc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations, net of tax	$ 2,400
Capital expenditure, discontinued operations		$ 31,500