Business Segments (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results

The following table provides a reconciliation of revenue and operating income by reportable segment to consolidated results (in thousands):

	Years Ended December 31,
	2019		2018		2017
Service revenues
Temporary and consultant staffing	$	4,412,125	$	4,330,566	$	4,011,042
Permanent placement staffing	533,432		511,989		439,214
Risk consulting and internal audit services	1,128,875		957,716		816,533
	$	6,074,432	$	5,800,271	$	5,266,789
Operating income
Temporary and consultant staffing	$	410,153	$	404,800	$	355,700
Permanent placement staffing	83,885		90,801		77,673
Risk consulting and internal audit services	127,713		93,324		83,907
	621,751		588,925		517,280
Amortization of intangible assets	1,361		1,705		1,563
Interest income, net	(5,125)		(4,382)		(1,799)
Income before income taxes	$	625,515	$	591,602	$	517,516

Revenue and Long-Lived Assets by Geographic Location

The following tables represent revenues and long-lived assets by geographic location (in thousands):

	Years Ended December 31,
	2019		2018		2017
Service revenues (a)
Domestic	$	4,708,715	$	4,433,767	$	4,121,701
Foreign (b)	1,365,717		1,366,504		1,145,088
	$	6,074,432	$	5,800,271	$	5,266,789
	December 31,
	2019		2018		2017
Property and equipment, net
Domestic	$	99,365	$	96,169	$	113,069
Foreign	29,020		29,007		31,818
	$	128,385	$	125,176	$	144,887

(a) There were no customers that accounted for more than 10% of the Company’s total service revenues in any year presented.

(b) No individual country represented more than 10% of revenues in any year presented.