Real Property Interests - Summary of Real Property Interests, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Right-of-use assets – finance leases	$ 244,885	$ 81,733
Cell site leasehold interests	886,679	468,969
Real property interests, gross	1,131,564	550,702
Right-of-use assets – finance leases	(7,023)	(1,235)
Cell site leasehold interests	(35,150)	(122,307)
Real property interests, net	$ 1,089,391	$ 427,160