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Fair value of financial instruments (Tables)
 3 Months Ended
Mar. 31, 2017
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 equity measured at fair value on a recurring basis as of March 31, 2017: 
 
Total
 
Quoted prices in
active markets for
identical assets
(Level 1)
 
Significant other
observable inputs
(Level 2)
 
Significant
unobservable
inputs
(Level 3)
Assets
 

 
 

 
 

 
 

Available-for-sale securities
$
48,124

 
$
48,124

 
$
—

 
$
—

Cash surrender value of life insurance policies
$
61,444

 
$
—

 
$
61,444

 
$
—

Interest rate cap agreements
$
4,712

 
$
—

 
$
4,712

 
$
—

Funds on deposit with third parties
$
79,459

 
$
79,459

 
$
—

 
$
—

Liabilities
 
 
 

 
 

 
 

Contingent earn-out obligations
$
8,565

 
$
—

 
$
—

 
$
8,565

Temporary equity
 

 
 

 
 

 
 

Noncontrolling interests subject to put provisions
$
979,848

 
$
—

 
$
—

 
$
979,848