Quarterly report pursuant to Section 13 or 15(d)

Goodwill - Summary of Changes to Carrying Amount of Goodwill (Detail)

v3.20.2
Goodwill - Summary of Changes to Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Beginning, Gross balance $ 81,090 $ 42,583
Beginning, Accumulated impairment losses (17,415) (17,415)
Beginning, Net balance 63,675 25,168
Ending, Gross balance 81,090 81,090
Ending, Accumulated impairment losses (17,415) (17,415)
Ending, Net balance 63,675 63,675
Neosho    
Goodwill [Line Items]    
Goodwill, Acquisition 0 2,183
Cortina    
Goodwill [Line Items]    
Goodwill, Acquisition 0 $ 36,324
Ending, Net balance $ 36,324