Quarterly report pursuant to Section 13 or 15(d)

Amortizable Intangible Assets - Summary of Significant Classes of Amortizable Intangible Assets (Detail)

v3.21.1
Amortizable Intangible Assets - Summary of Significant Classes of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Cost $ 63,041 $ 62,914
Accumulated Amortization (59,478) (58,897)
Net 3,563 4,017
Customer Lists and Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 24,139 24,012
Accumulated Amortization (22,690) (22,533)
Net 1,449 1,479
Domain and Brand Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 20,350 20,350
Accumulated Amortization (19,367) (19,127)
Net 983 1,223
Favorable and Assigned Leases [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 2,188 2,188
Accumulated Amortization (1,947) (1,943)
Net 241 245
Subscriber Base and Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 9,886 9,886
Accumulated Amortization (9,087) (8,974)
Net 799 912
Author Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 2,771 2,771
Accumulated Amortization (2,767) (2,765)
Net 4 6
Non-Compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 2,041 2,041
Accumulated Amortization (1,991) (1,954)
Net 50 87
Other Amortizable Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 1,666 1,666
Accumulated Amortization (1,629) (1,601)
Net $ 37 $ 65