Fair Value Measurements - Assets and liabilities measured at fair value on recurring basis that have unobservable inputs (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2020 USD ($)
Recurring basis | Level 3 | Scenario based method | Credit spread | Business Combination, One | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	14.05	15.73
Recurring basis | Level 3 | Scenario based method | Credit spread | Business Combination, One | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	14.20	15.74
Recurring basis | Level 3 | Scenario based method | Discount rate | Business Combination, One | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	18.71	19.85
Recurring basis | Level 3 | Scenario based method | Discount rate | Business Combination, One | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	19.67	20.68
Recurring basis | Level 3 | Monte carlo simulation | Credit spread | Business Combination, Two
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	14.20	15.74
Recurring basis | Level 3 | Monte carlo simulation | Credit spread | Business Combination, Three
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	14.19	15.73
Recurring basis | Level 3 | Monte carlo simulation | Discount rate | Business Combination, Two
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	19.64
Recurring basis | Level 3 | Monte carlo simulation | Discount rate | Business Combination, Two | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		20.00
Recurring basis | Level 3 | Monte carlo simulation | Discount rate | Business Combination, Two | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		20.30
Recurring basis | Level 3 | Monte carlo simulation | Revenue volatility | Business Combination, Two
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	38.64	45.29
Recurring basis | Level 3 | Monte carlo simulation | Revenue volatility | Business Combination, Three
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	25.00
Recurring basis | Level 3 | Monte carlo simulation | Revenue volatility | Business Combination, Three | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		23.1
Recurring basis | Level 3 | Monte carlo simulation | Revenue volatility | Business Combination, Three | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		35.7
Recurring basis | Level 3 | Monte carlo simulation | Revenue volatility | Business Combination, Three | Weighted Average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		(35.0)
Recurring basis | Level 3 | Monte carlo simulation | Gross profit volatility | Business Combination, Three
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input	55.00
Recurring basis | Level 3 | Monte carlo simulation | Gross profit volatility | Business Combination, Three | Minimum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		23.2
Recurring basis | Level 3 | Monte carlo simulation | Gross profit volatility | Business Combination, Three | Maximum
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		106.7
Recurring basis | Level 3 | Monte carlo simulation | Gross profit volatility | Business Combination, Three | Weighted Average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration, measurement input		(60.0)
Fair value | Giner ELX, Inc | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent consideration			$ 16,000
Fair value | United Hydrogen Group Inc | Contingent consideration
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent consideration			$ 1,100
Fair value | Recurring basis | Level 3
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration	$ 121,251	$ 116,165
Fair value | Recurring basis | Level 3 | Scenario based method | Business Combination, One
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration	75,491	85,269
Fair value | Recurring basis | Level 3 | Monte carlo simulation | Business Combination, Two
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration	10,960	11,310
Fair value | Recurring basis | Level 3 | Monte carlo simulation | Business Combination, Three
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent Consideration	$ 34,800	$ 19,586