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Identifiable Intangible Assets from Acquisitions - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 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 | 1,378,000 | $ 1,206,000 | 2,559,000 | $ 2,969,000 |  |
Estimated amortization expense in 2021 | 2,000,000.0 |  | 2,000,000.0 |  |  |
Estimated amortization expense in 2022 | 2,100,000 |  | 2,100,000 |  |  |
Estimated amortization expense in 2023 | 2,000,000.0 |  | 2,000,000.0 |  |  |
Estimated amortization expense in 2024 | 602,000 |  | 602,000 |  |  |
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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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