Segment Information - Summary of Total Assets by Business Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 4,731,818	$ 5,017,000
Leasing
Segment Reporting Information [Line Items]
Total assets	2,295,289	2,341,734
Fiber Infrastructure
Segment Reporting Information [Line Items]
Total assets	2,354,569	2,362,267
Towers
Segment Reporting Information [Line Items]
Total assets		235,888
Consumer CLEC
Segment Reporting Information [Line Items]
Total assets	8,707	10,687
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 73,253	$ 66,424