Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Amortizable Intangible Assets - Summary of Significant Classes of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Cost $ 60,554 $ 62,914
Accumulated Amortization (57,769) (58,897)
Net 2,785 4,017
Customer Lists and Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 23,700 24,012
Accumulated Amortization (21,987) (22,533)
Net 1,713 1,479
Domain and Brand Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 19,875 20,350
Accumulated Amortization (19,340) (19,127)
Net 535 1,223
Favorable and Assigned Leases [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 2,188 2,188
Accumulated Amortization (1,955) (1,943)
Net 233 245
Subscriber Base and Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 8,647 9,886
Accumulated Amortization (8,343) (8,974)
Net 304 912
Author Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 2,771 2,771
Accumulated Amortization (2,771) (2,765)
Net   6
Non-Compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 2,041 2,041
Accumulated Amortization (2,041) (1,954)
Net   87
Other Amortizable Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 1,332 1,666
Accumulated Amortization $ (1,332) (1,601)
Net   $ 65