Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net - Summary of Intangible Assets (Detail)

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Intangible Assets, Net - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Cost of intangible assets gross, beginning balance $ 46,521 $ 46,527 $ 46,527
Disposal     (6)
Cost of intangible assets gross, ending balance 46,521   46,521
Accumulated amortization, beginning balance (19,968) (17,241) (17,241)
Amortization expense (657) (703) (2,733)
Disposal     6
Accumulated amortization, ending balance (20,625)   (19,968)
Net book value $ 25,896   26,553
Minimum      
Useful lives 3 years    
Maximum      
Useful lives 20 years    
Customer Relationships      
Cost of intangible assets gross, beginning balance $ 44,060 44,060 44,060
Cost of intangible assets gross, ending balance 44,060   44,060
Accumulated amortization, beginning balance (17,507) (14,833) (14,833)
Amortization expense (657)   (2,674)
Accumulated amortization, ending balance (18,164)   (17,507)
Net book value $ 25,896   $ 26,553
Customer Relationships | Minimum      
Useful lives 10 years   10 years
Customer Relationships | Maximum      
Useful lives 20 years   20 years
Other Intangible Assets      
Cost of intangible assets gross, beginning balance $ 2,461 2,467 $ 2,467
Disposal     (6)
Cost of intangible assets gross, ending balance 2,461   2,461
Accumulated amortization, beginning balance (2,461) $ (2,408) (2,408)
Amortization expense     (59)
Disposal     6
Accumulated amortization, ending balance $ (2,461)   $ (2,461)
Other Intangible Assets | Minimum      
Useful lives 3 years   3 years
Other Intangible Assets | Maximum      
Useful lives 5 years   5 years