Business Segments (Tables)

6 Months Ended

Jun. 30, 2018

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 for the three and six months ended June 30, 2018 and 2017 (in thousands):

	Three Months Ended   June 30,						Six Months Ended   June 30,
	2018			2017			2018			2017
Net service revenues
Temporary and consultant staffing	$	1,087,974		$	998,296		$	2,154,262		$	1,985,902
Permanent placement staffing	135,038			112,653			256,438			216,286
Risk consulting and internal audit services	234,042			197,479			441,687			393,610
	$	1,457,054		$	1,308,428		$	2,852,387		$	2,595,798
Operating income
Temporary and consultant staffing	$	103,570		$	93,088		$	200,293		$	183,459
Permanent placement staffing	27,436			21,046			49,815			39,348
Risk consulting and internal audit services	18,505			16,583			33,770			33,489
	149,511			130,717			283,878			256,296
Amortization of intangible assets	442			365			905			666
Interest income, net	(1,006		)	(355		)	(1,741		)	(578		)
Income before income taxes	$	150,075		$	130,707		$	284,714		$	256,208