Investment in Real Estate - Schedule of Gross Investment in Real Estate (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Successor [Member]
Real Estate Properties [Line Items]
Land	$ 89.6	$ 89.3
Building and Improvements	787.0
Equipment	206.4	190.2
Successor [Member] | West Seventh St., Cincinnati, OH (7th Street) [Member]
Real Estate Properties [Line Items]
Land	0.9
Building and Improvements	107.6
Equipment	11.5
Successor [Member] | Parkway Dr., Mason, OH (Mason) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	20.2
Equipment	0.6
Successor [Member] | Industrial Rd., Florence, KY (Florence) [Member]
Real Estate Properties [Line Items]
Land	2.2
Building and Improvements	41.4
Equipment	2.6
Successor [Member] | Goldcoast Dr., Cincinnati, OH (Goldcoast) [Member]
Real Estate Properties [Line Items]
Land	0.6
Building and Improvements	6.7
Equipment	0.1
Successor [Member] | Knightsbridge Dr., Hamilton, OH (Hamilton) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	49.2
Equipment	3.6
Successor [Member] | E. Monroe St., South Bend, IN (Monroe St.) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	2.5
Equipment	0
Successor [Member] | Springer St., Lombard, IL (Lombard) [Member]
Real Estate Properties [Line Items]
Land	0.7
Building and Improvements	4.6
Equipment	0.2
Successor [Member] | Crescent Circle, South Bend, IN (Blackthorn) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	3.3
Equipment	0.2
Successor [Member] | Kingsview Dr., Lebanon, OH (Lebanon) [Member]
Real Estate Properties [Line Items]
Land	4.0
Building and Improvements	74.1
Equipment	3.6
Successor [Member] | McAuley Place, Blue Ash, OH (Blue Ash) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	0.6
Equipment	0
Successor [Member] | Westway Park Blvd., Houston, TX (Houston West) [Member]
Real Estate Properties [Line Items]
Land	1.4
Building and Improvements	84.4
Equipment	41.4
Successor [Member] | Westway Park Blvd., Houston, TX (Houston West 2) [Member]
Real Estate Properties [Line Items]
Land	2.0
Building and Improvements	22.5
Equipment	15.9
Successor [Member] | Houston, TX (Houston-MetroNational) [Member]
Real Estate Properties [Line Items]
Land	18.4
Building and Improvements	0
Equipment	0
Successor [Member] | Southwest Fwy., Houston, TX (Galleria) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	68.5
Equipment	13.5
Successor [Member] | E. Ben White Blvd., Austin, TX (Austin 1) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	22.5
Equipment	1.2
Successor [Member] | S. State Highway 121 Business Lewisville, TX (Lewisville) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	77.0
Equipment	20.6
Successor [Member] | Marsh Lane Carrollton, TX [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	0.1
Equipment	0.5
Successor [Member] | Midway Rd., Carrollton, TX [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	2.0
Equipment	0.4
Successor [Member] | Frankford Carrollton, TX [Member]
Real Estate Properties [Line Items]
Land	16.1
Building and Improvements	42.8
Equipment	38.1
Successor [Member] | Bryan St., Dallas, TX [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	0.1
Equipment	0.1
Successor [Member] | North Freeway, Houston, TX (Greenspoint) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	1.3
Equipment	0.4
Successor [Member] | South Ellis Street Chandler, AZ (Phoenix) [Member]
Real Estate Properties [Line Items]
Land	15.0
Building and Improvements	55.9
Equipment	18.0
Successor [Member] | Westover Hills Blvd, San Antonio, TX (San Antonio) [Member]
Real Estate Properties [Line Items]
Land	4.6
Building and Improvements	32.1
Equipment	31.1
Successor [Member] | Westover Hills Blvd San Antonio 2 [Member]
Real Estate Properties [Line Items]
Land	6.9
Building and Improvements	0
Equipment	0
Successor [Member] | Metropolis Dr., Austin, TX (Austin 2) [Member]
Real Estate Properties [Line Items]
Land	2.0
Building and Improvements	23.1
Equipment	2.0
Successor [Member] | Kestral Way (London) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	35.1
Equipment	0.7
Successor [Member] | Jurong East (Singapore) [Member]
Real Estate Properties [Line Items]
Land	0
Building and Improvements	9.4
Equipment	0.1
Predecessor [Member]
Real Estate Properties [Line Items]
Land		89.3
Building and Improvements		783.7
Equipment		190.2
Predecessor [Member] | West Seventh St., Cincinnati, OH (7th Street) [Member]
Real Estate Properties [Line Items]
Land		0.9
Building and Improvements		107.6
Equipment		11.0
Predecessor [Member] | Parkway Dr., Mason, OH (Mason) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		20.2
Equipment		0.6
Predecessor [Member] | Industrial Rd., Florence, KY (Florence) [Member]
Real Estate Properties [Line Items]
Land		2.2
Building and Improvements		41.4
Equipment		2.4
Predecessor [Member] | Goldcoast Dr., Cincinnati, OH (Goldcoast) [Member]
Real Estate Properties [Line Items]
Land		0.6
Building and Improvements		6.7
Equipment		0.1
Predecessor [Member] | Knightsbridge Dr., Hamilton, OH (Hamilton) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		49.2
Equipment		3.6
Predecessor [Member] | E. Monroe St., South Bend, IN (Monroe St.) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		2.5
Equipment		0
Predecessor [Member] | Springer St., Lombard, IL (Lombard) [Member]
Real Estate Properties [Line Items]
Land		0.7
Building and Improvements		4.6
Equipment		0.2
Predecessor [Member] | Crescent Circle, South Bend, IN (Blackthorn) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		3.3
Equipment		0.2
Predecessor [Member] | Kingsview Dr., Lebanon, OH (Lebanon) [Member]
Real Estate Properties [Line Items]
Land		4.0
Building and Improvements		71.7
Equipment		2.2
Predecessor [Member] | McAuley Place, Blue Ash, OH (Blue Ash) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		0.6
Equipment		0
Predecessor [Member] | Westway Park Blvd., Houston, TX (Houston West) [Member]
Real Estate Properties [Line Items]
Land		1.4
Building and Improvements		84.4
Equipment		39.4
Predecessor [Member] | Westway Park Blvd., Houston, TX (Houston West 2) [Member]
Real Estate Properties [Line Items]
Land		2.0
Building and Improvements		22.4
Equipment		15.8
Predecessor [Member] | Houston, TX (Houston-MetroNational) [Member]
Real Estate Properties [Line Items]
Land		18.3
Building and Improvements		0
Equipment		0
Predecessor [Member] | Southwest Fwy., Houston, TX (Galleria) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		68.4
Equipment		13.3
Predecessor [Member] | E. Ben White Blvd., Austin, TX (Austin 1) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		22.5
Equipment		1.2
Predecessor [Member] | S. State Highway 121 Business Lewisville, TX (Lewisville) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		77.0
Equipment		20.3
Predecessor [Member] | Marsh Lane Carrollton, TX [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		0.1
Equipment		0.5
Predecessor [Member] | Midway Rd., Carrollton, TX [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		2.0
Equipment		0.4
Predecessor [Member] | Frankford Carrollton, TX [Member]
Real Estate Properties [Line Items]
Land		16.1
Building and Improvements		42.6
Equipment		34.8
Predecessor [Member] | Bryan St., Dallas, TX [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		0.1
Equipment		0.1
Predecessor [Member] | North Freeway, Houston, TX (Greenspoint) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		1.3
Equipment		0.4
Predecessor [Member] | South Ellis Street Chandler, AZ (Phoenix) [Member]
Real Estate Properties [Line Items]
Land		15.0
Building and Improvements		55.7
Equipment		11.7
Predecessor [Member] | Westover Hills Blvd, San Antonio, TX (San Antonio) [Member]
Real Estate Properties [Line Items]
Land		4.6
Building and Improvements		32.1
Equipment		29.5
Predecessor [Member] | Westover Hills Blvd San Antonio 2 [Member]
Real Estate Properties [Line Items]
Land		6.7
Building and Improvements		0
Equipment		0
Predecessor [Member] | Metropolis Dr., Austin, TX (Austin 2) [Member]
Real Estate Properties [Line Items]
Land		2.0
Building and Improvements		23.1
Equipment		1.7
Predecessor [Member] | Kestral Way (London) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		34.8
Equipment		0.7
Predecessor [Member] | Jurong East (Singapore) [Member]
Real Estate Properties [Line Items]
Land		0
Building and Improvements		9.4
Equipment		0.1
CyrusOne L.P. [Member] | Successor [Member]
Real Estate Properties [Line Items]
Land	89.6	89.3
Equipment	206.4	190.2
Metropolis Dr., Austin, TX (Austin 3) [Member] | Successor [Member]
Real Estate Properties [Line Items]
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7.9
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Equipment	0
Metropolis Dr., Austin, TX (Austin 3) [Member] | Predecessor [Member]
Real Estate Properties [Line Items]
Real Estate and Accumulated Depreciation, Carrying Amount of Land		7.9
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		0
Real Estate and Accumulated Depreciation, Carrying Amount of Equipment		0
Ridgetop Circle, Sterling, VA (Northern VA) [Member] | Successor [Member]
Real Estate Properties [Line Items]
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6.9
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Equipment	0
Ridgetop Circle, Sterling, VA (Northern VA) [Member] | Predecessor [Member]
Real Estate Properties [Line Items]
Real Estate and Accumulated Depreciation, Carrying Amount of Land		6.9
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements		0
Real Estate and Accumulated Depreciation, Carrying Amount of Equipment		$ 0