Basis of Presentation and Summary of Significant Accounting Policies - Carrying Amounts and Fair Values of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 84,828	$ 135,235
Marketable securities – certificates of deposit	1,000
Marketable securities – equity securities	3,114	5,567
Total assets	91,469	145,866
Total liabilities	6,868	6,868
APCMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	1,000	1,000
AAMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	5,851	5,851
VOMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	17	17
Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,527	3,164
Contingent equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		1,900
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	84,828	135,235
Marketable securities – certificates of deposit	1,000
Marketable securities – equity securities	3,114	5,567
Total assets	88,942	140,802
Total liabilities	0	0
Level 1 | APCMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	0	0
Level 1 | AAMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	0	0
Level 1 | VOMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	0	0
Level 1 | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Level 1 | Contingent equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Marketable securities – certificates of deposit	0
Marketable securities – equity securities	0	0
Total assets	2,527	3,164
Total liabilities	0	0
Level 2 | APCMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	0	0
Level 2 | AAMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	0	0
Level 2 | VOMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	0	0
Level 2 | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,527	3,164
Level 2 | Contingent equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Marketable securities – certificates of deposit	0
Marketable securities – equity securities	0	0
Total assets	0	1,900
Total liabilities	6,868	6,868
Level 3 | APCMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	1,000	1,000
Level 3 | AAMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	5,851	5,851
Level 3 | VOMG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
APCMG contingent consideration (see Note 1)	17	17
Level 3 | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 0	0
Level 3 | Contingent equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		$ 1,900