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Fair value of financial instruments (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Assets, Liabilities and Temporary Equity Measured at Fair Value on a Recurring Basis
The following table summarizes the Company’s assets, liabilities and temporary equities measured at fair value on a recurring basis as of March 31, 2021: 
TotalQuoted prices in
active markets
for identical assets
(Level 1)
Significant other
observable inputs
(Level 2)
Significant
unobservable
inputs
(Level 3)
Assets    
Investments in equity securities$34,730 $34,730 $— $— 
Interest rate cap agreements$9,176 $— $9,176 $— 
Liabilities   
Contingent earn-out obligations$28,225 $— $— $28,225 
Temporary equity    
Noncontrolling interests subject to put provisions$1,349,160 $— $— $1,349,160