Spectrum repacking reimbursements and other, net - Schedule of Non-Cash Impairment Charges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unusual or Infrequent Items, or Both [Abstract]
Reimbursement of spectrum repacking	$ (4,942)	$ (13,180)	$ (16,974)
Tangible Asset Impairment Charges (Recoveries)	1,095	0	(2,880)
Intangible asset impairments and other charges	0	3,225	9,063
Contract termination and other costs related to national sales	1,540	0	5,456
Total spectrum repacking reimbursements and other, net	$ (2,307)	$ (9,955)	$ (5,335)