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Identifiable Intangible Assets from Acquisitions - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Mar. 31, 2020
Finite Lived Intangible Assets [Line Items]
Pre-tax non-cash impairment totaling	$ 4,959,000		$ 4,959,000		$ 4,959,000	$ 5,000,000.0
Amortization of intangible assets from acquisitions	1,149,000	$ 1,206,000	3,708,000	$ 4,175,000
Estimated remaining amortization expense in 2021	904,000		904,000
Estimated amortization expense in 2022	2,300,000		2,300,000
Estimated amortization expense in 2023	2,200,000		2,200,000
Estimated amortization expense in 2024	704,000		704,000
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Pre-tax non-cash impairment totaling	3,430,000		$ 3,430,000		3,430,000
Weighted average useful life			5 years
Technologies
Finite Lived Intangible Assets [Line Items]
Pre-tax non-cash impairment totaling	1,062,000		$ 1,062,000		1,062,000
Weighted average useful life			3 years
Tradenames
Finite Lived Intangible Assets [Line Items]
Pre-tax non-cash impairment totaling	121,000		$ 121,000		121,000
Weighted average useful life			2 years
Non-compete Agreements
Finite Lived Intangible Assets [Line Items]
Pre-tax non-cash impairment totaling	$ 346,000		$ 346,000		$ 346,000
Non-compete Agreements | Minimum
Finite Lived Intangible Assets [Line Items]
Weighted average useful life			1 year
Non-compete Agreements | Maximum
Finite Lived Intangible Assets [Line Items]
Weighted average useful life			2 years

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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