Annual report pursuant to Section 13 and 15(d)

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

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Goodwill - Summary of Changes to Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Beginning, Gross balance $ 42,583 $ 42,583
Beginning, Accumulated impairment losses (17,415) (17,415)
Beginning, Net balance 25,168 25,168
Ending, Gross balance 81,090 42,583
Ending, Accumulated impairment losses (17,415) (17,415)
Ending, Net balance 63,675 25,168
Neosho    
Goodwill [Line Items]    
Goodwill, Acquisition 2,183 0
Cortina    
Goodwill [Line Items]    
Goodwill, Acquisition 36,324 $ 0
Ending, Net balance $ 36,324