Balance Sheet Details (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Other current assets:
Restricted cash and cash equivalents	$ 31,041	$ 29,262
Income taxes receivable	1,022	0
Other	22,261	37,568
Other current assets	54,324	66,830
Prepaid expenses:
Prepaid payroll deposits	10,733	60,014
Other	16,697	12,446
Prepaid expenses	27,430	72,460
Fixed assets:
Furniture and equipment	44,352	43,134
Software	293,631	265,137
Leasehold improvements	2,891	8,797
Fixed assets, gross	340,874	317,068
Accumulated depreciation	(204,384)	(189,954)
Fixed assets, net	136,490	127,114
Other assets:
Life insurance cash surrender value	107,641	115,095
Other	40,929	41,575
Other assets	148,570	156,670
Accounts payable and accrued expenses:
Trade accounts payable	85,863	77,325
Subcontractor payable	263,582	261,689
Accrued expenses	80,216	61,220
Loss contingencies	10,774	10,400
Professional liability reserve	6,723	7,127
Other	11,827	7,496
Accounts payable and accrued expenses	458,985	425,257
Accrued compensation and benefits:
Accrued payroll	137,063	98,817
Accrued bonuses and commissions	120,272	105,155
Accrued travel expense	2,964	3,058
Health insurance reserve	6,739	6,041
Workers compensation reserve	12,051	12,384
Deferred compensation	117,311	119,617
Other	19,975	9,309
Accrued compensation and benefits	416,375	354,381
Other current liabilities:
Income taxes payable	0	21,162
Client deposits	56,159	141,102
Other	2,489	155
Other current liabilities	58,648	162,419
Other long-term liabilities:
Workers compensation reserve	24,471	24,130
Professional liability reserve	34,068	34,544
Unrecognized tax benefits	4,731	4,633
Acquisition related liabilities	8,580	0
Other	33,797	33,682
Other long-term liabilities	$ 105,647	$ 96,989