Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Accrued expenses	$ 0.7	$ 2.1
Accounts receivable	0.6	0.6
Net operating loss carryforward	20.5	72.6
Stock-based compensation	1.2	1.4
Credits	0.1	0.2
Lease obligations	12.6
Deferred state taxes		2.8
Other	0.6	2.1
Net deferred tax assets	36.3	81.8
Deferred tax liabilities:
Intangible assets	(65.7)	(70.1)
Property and equipment	(4.0)	(1.3)
Lease assets	(10.9)
Tax gain deferral - FCC auction for broadcast spectrum		(57.1)
Net deferred tax liabilities	(80.6)	(128.5)
Deferred Liabilities Net	$ (44.3)	$ (46.7)