Segment Information - Summary of Total Assets by Business Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total assets	$ 3,318,752	$ 2,542,636
Leasing
Segment Reporting Information [Line Items]
Total assets	2,390,431	2,527,915
Fiber Infrastructure
Segment Reporting Information [Line Items]
Total assets	914,082
Consumer CLEC
Segment Reporting Information [Line Items]
Total assets	$ 14,239	$ 14,721