Acquisitions - Additional Information (Detail) £ / shares in Units, € in Millions									2 Months Ended	3 Months Ended			6 Months Ended			12 Months Ended
	May 01, 2017 USD ($) data_center_building	Apr. 06, 2017	Feb. 03, 2017 USD ($)	Dec. 06, 2016 USD ($)	Aug. 01, 2016 EUR (€)	Aug. 01, 2016 USD ($)	Jan. 15, 2016 GBP (£) £ / shares	Jan. 15, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	May 29, 2015 GBP (£)	May 29, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill									$ 4,225,553,000	$ 4,225,553,000	$ 2,986,064,000		$ 4,225,553,000			$ 2,986,064,000
Repayment of capital lease and other financing obligations													44,460,000		$ 45,335,000
Loss on debt extinguishment										16,444,000		$ 605,000	19,947,000		605,000
Revenue										1,066,421,000		900,510,000	2,015,946,000		1,744,666,000
Net income										45,805,000		44,711,000	87,867,000		$ 13,600,000
Verizon [Member]
Business Acquisition [Line Items]
Data center buildings | data_center_building	29
Cash consideration for acquisition	$ 3,600,000,000
Property, plant and equipment	837,559,000
Goodwill	1,087,571,000
Intangible assets	1,702,900,000
Capital lease and other financing obligations	17,025,000
Acquisition costs										24,500,000			26,400,000
Deferred tax liabilities	$ 16,878,000
Revenue									86,700,000	$ 86,700,000			86,700,000
Net income									$ 27,400,000
IO
Business Acquisition [Line Items]
Cash consideration for acquisition			$ 36,300,000
Property, plant and equipment			40,300,000
Goodwill			17,900,000
Intangible assets			6,300,000
Deferred tax assets			6,300,000
Capital lease and other financing obligations			$ 33,100,000
Acquired intangible assets, Estimated useful lives (years)			10 years
Digital Realty [Member]
Business Acquisition [Line Items]
Cash consideration for acquisition					€ 193.8	$ 216,400,000
Property, plant and equipment						143,972,000
Goodwill						48,835,000
Intangible assets						11,758,000
Repayment of capital lease and other financing obligations					47.8	53,400,000
Loss on debt extinguishment					€ 8.8	9,900,000
Acquisition costs																12,000,000
Deferred tax liabilities						$ 42,395,000
Revenue													6,400,000
Telecity Group plc [Member]
Business Acquisition [Line Items]
Property, plant and equipment								$ 1,058,583,000
Goodwill								2,215,567,000
Intangible assets								694,243,000
Deferred tax assets								994,000
Capital lease and other financing obligations								$ 165,365,000
Acquisition costs																$ 42,500,000
Payments to acquire businesses, per share acquired | £ / shares							£ 5.725
Ratio of shares acquired							0.0336	0.0336
Consideration transferred							£ 2,624,500,000	$ 3,743,600,000
Assumed, unvested stock compensation awards								1,300,000
Cash placed in restricted account																	£ 322,900,000	$ 475,700,000
Business combination, provisional information, initial accounting incomplete, adjustment, intangibles											36,800,000
Business combination, provisional information, initial accounting incomplete, adjustment, deferred tax liabilities											19,500,000
Business combination, provisional information, initial accounting incomplete, adjustment, capital lease and other financing obligations											(34,400,000)
Business combination, provisional information, initial accounting incomplete, adjustment, goodwill											(22,500,000)
Business combination, provisional information, initial accounting incomplete, adjustment, asets held for sale											$ (36,900,000)
Deferred tax liabilities								$ 176,168,000
Revenue												107,200,000		$ 191,700,000
Net income												$ (35,900,000)		$ (38,700,000)
Telecity Group plc [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Estimated useful lives (years)							13 years 6 months	13 years 6 months
Discount rate (percent)							8.50%	8.50%
Telecity Group plc [Member] | Trade names [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Estimated useful lives (years)							1 year 6 months	1 year 6 months
Discount rate (percent)							9.00%	9.00%
Relief of royalty rate (percent)							2.00%	2.00%
Bridge term loan [Member] | Verizon [Member]
Business Acquisition [Line Items]
Short-term debt				$ 2,000,000,000.0
Commitment fee percentage		0.25%
Commitment fees													10,000,000
Amortization of debt issuance costs													$ 7,800,000
Bridge term loan [Member] | Telecity Group plc [Member]
Business Acquisition [Line Items]
Short-term debt																	£ 875,000,000	$ 1,289,000,000
Minimum [Member] | Verizon [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Estimated useful lives (years)	12 years
Discount rate (percent)	7.70%
Minimum [Member] | Bridge term loan [Member] | Verizon [Member]
Business Acquisition [Line Items]
Commitment fee percentage				0.50%
Maximum [Member] | Verizon [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Estimated useful lives (years)	15 years
Discount rate (percent)	10.70%