Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 342,527	$ 294,953
Accounts receivable, net	809,878	711,357
Current portion of notes receivable	32,823	35,253
Prepaid expenses and other current assets	83,266	88,144
Total current assets	1,268,494	1,129,707
Property and equipment, net	132,857	101,642
Operating lease assets	224,961	156,645
Goodwill	1,234,023	1,234,879
Intangible assets, net	34,504	41,550
Notes receivable, net	59,123	61,121
Other assets	52,962	51,819
Total assets	3,006,924	2,777,363
Current liabilities
Accounts payable, accrued expenses and other	157,794	170,066
Accrued compensation	451,549	455,933
Billings in excess of services provided	36,279	44,172
Total current liabilities	645,622	670,171
Long-term debt, net	319,355	286,131
Noncurrent operating lease liabilities	232,390	161,677
Deferred income taxes	168,232	158,342
Other liabilities	97,022	100,861
Total liabilities	1,462,621	1,377,182
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.01 par value; shares authorized — 5,000; none outstanding	0	0
Common stock, $0.01 par value; shares authorized — 75,000; shares issued and outstanding — 34,295 (2021) and 34,481 (2020)	343	345
Additional paid-in capital	8,490	0
Retained earnings	1,659,947	1,506,271
Accumulated other comprehensive loss	(124,477)	(106,435)
Total stockholders' equity	1,544,303	1,400,181
Total liabilities and stockholders' equity	$ 3,006,924	$ 2,777,363