Annual report pursuant to Section 13 and 15(d)

Basis of Presentation - Additional Information (Detail)

v3.20.4
Basis of Presentation - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Segments
Dec. 31, 2019
USD ($)
Number of operating segments | Segments 3  
Revolving Credit Facility [Member]    
Debt instrument maximum borrowing capacity $ 24.2 $ 26.4
Debt instrument outstanding $ 5.0 $ 12.4