The Company and Significant Accounting Policies - Financial Assets and Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Mar. 31, 2026
Fair Value, Measurements, Recurring \| Money Market Account
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value and Carrying Value on Assets	$ 1.3	$ 2.1
Fair Value, Measurements, Recurring \| Corporate Bonds and Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value and Carrying Value on Assets	3.8	3.0
Fair Value, Measurements, Recurring \| Level 1 \| Money Market Account
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value and Carrying Value on Assets	1.3	2.1
Fair Value, Measurements, Recurring \| Level 2 \| Corporate Bonds and Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value and Carrying Value on Assets	3.8	$ 3.0
Fair Value, Measurements, Nonrecurring \| FCC Licenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value and Carrying Value on Assets	62.3
Total Gains (Losses)	(26.0)
Fair Value, Measurements, Nonrecurring \| Level 3 \| FCC Licenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value and Carrying Value on Assets	$ 62.3