Noncontrolling Interests - Operating Partnership (Details) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 shares
Noncontrolling Interests - Operating Partnership
Redemption value of the noncontrolling interest \| $	$ 634,700				$ 634,700
Closing price of the Company's stock (in dollars per share) \| $ / shares	$ 134.60				$ 134.60
Carlyle Group
Noncontrolling Interests - Operating Partnership
Conversion ratio for common operating partnership units					1
Number of Operating Partnership Units (in shares)	1,201,300				1,201,300
Reduction to noncontrolling interests in the Operating Partnership and an increase to common stock and additional paid in capital \| $					$ 1,600
Noncontrolling Interests
Noncontrolling Interests - Operating Partnership
Reduction to noncontrolling interests in the Operating Partnership and an increase to common stock and additional paid in capital \| $	$ 1,215	$ (458)	$ 22,557	$ 11
Operating partnership
Noncontrolling Interests - Operating Partnership
Conversion ratio for common operating partnership units					1
Number of Operating Partnership Units (in shares)	48,386,680				48,386,680	48,193,006
Percentage of Total	100.00%				100.00%	100.00%
Shares of common stock issued related to employee compensation arrangements					193,674
Quarterly distributions will receive by holders of operating partnership units (in dollars per unit) \| $ / shares					$ 2.46
Operating partnership \| Coresite Realty Corporation
Noncontrolling Interests - Operating Partnership
Number of Operating Partnership Units (in shares)	43,671,195				43,671,195	42,276,221
Percentage of Total	90.30%				90.30%	87.70%
Operating partnership \| Noncontrolling interests
Noncontrolling Interests - Operating Partnership
Number of Operating Partnership Units (in shares)	4,715,485				4,715,485	5,916,785
Percentage of Total	9.70%				9.70%	12.30%

CoreSite Realty Corp 10-Q