Amount of additional consideration transferred in a business combination.

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Amount of deferred payment obligations incurred by the acquirer as part of consideration transferred in a business combination.

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The amount of other assets (liabilities).

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Acquisitions - Schedule of aggregate purchase price of acquisitions allocated on a preliminary basis (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended					9 Months Ended		12 Months Ended
	Oct. 31, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Acquisitions
Cash paid, net of cash acquired							$ 39,253	$ 16,854
2021 Acquisitions
Acquisitions
Cash paid, net of cash acquired		$ 3,900	$ 16,000	$ 19,200			39,104
Issuance of Seller Notes at fair value		1,500	4,900	4,000			10,442
Additional consideration, net		800	100	1,000			1,892
Aggregate purchase price		6,200	$ 21,000	$ 24,200			51,438
Accounts receivable		2,609					2,609
Inventories		1,957					1,957
Other assets and liabilities, net		(3,915)					(3,915)
Net assets acquired		6,218					6,218
Goodwill							45,220
2021 Acquisitions \| Customer relationships
Acquisitions
Other intangible assets, net		5,505					$ 5,505
Weighted average useful life of intangible assets							5 years
2021 Acquisitions \| Non-compete agreements
Acquisitions
Other intangible assets, net		$ 62					$ 62
Weighted average useful life of intangible assets							5 years
2020 Acquisitions
Acquisitions
Cash paid, net of cash acquired					$ 4,900	$ 16,800			$ 21,709
Issuance of Seller Notes at fair value					1,900	21,900			23,766
Deferred payment obligation at fair value						3,500			3,468
Additional consideration, net	$ 3,600				300	4,000			4,319
Aggregate purchase price					7,100	$ 46,200			53,262
Accounts receivable					4,224				4,224
Inventories					2,276				2,276
Other assets and liabilities, net					(4,561)				(4,561)
Net assets acquired					8,497				8,497
Goodwill									44,765
2020 Acquisitions \| Customer relationships
Acquisitions
Other intangible assets, net					6,358				$ 6,358
Weighted average useful life of intangible assets									5 years
2020 Acquisitions \| Non-compete agreements
Acquisitions
Other intangible assets, net					$ 200				$ 200
Weighted average useful life of intangible assets									5 years