Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment

The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Apex:
Revenues	$	589,717		$	517,492		$	1,695,728		$	1,502,462
Gross profit	177,831			155,783			506,146			445,925
Operating income	71,443			59,016			192,610			162,679
Amortization	6,546			7,194			19,638			21,983
Oxford:
Revenues	$	152,701		$	149,556		$	455,222		$	444,427
Gross profit	62,712			62,532			187,321			183,471
Operating income	15,156			16,088			39,794			39,525
Amortization	1,040			1,054			3,143			3,028
ECS:
Revenues	$	164,031		$	—		$	319,181		$	—
Gross profit	29,629			—			58,288			—
Operating income	4,314			—			8,012			—
Amortization	10,954			—			21,908			—
Corporate:
Operating loss(1)	$	(16,616	)	$	(14,234	)	$	(54,745	)	$	(38,265	)
Consolidated:
Revenues	$	906,449		$	667,048		$	2,470,131		$	1,946,889
Gross profit	270,172			218,315			751,755			629,396
Operating income	74,297			60,870			185,671			163,939
Amortization	18,540			8,248			44,689			25,011

_____________

(1) Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets.

Disaggregation of Revenue [Table Text Block]

The following table presents our revenues disaggregated by type (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Apex:
Assignment	$	575,309	$	506,376	$	1,653,835	$	1,468,976
Permanent placement	14,408		11,116		41,893		33,486
	$	589,717	$	517,492	$	1,695,728	$	1,502,462
Oxford:
Assignment	$	130,365	$	127,963	$	386,068	$	379,892
Permanent placement	22,336		21,593		69,154		64,535
	$	152,701	$	149,556	$	455,222	$	444,427
ECS:
Firm-fixed-price	$	48,272	$	—	$	93,034	$	—
Time and materials	42,102		—		91,097		—
Cost-plus-fixed-fee	73,657		—		135,050		—
	$	164,031	$	—	$	319,181	$	—
Consolidated	$	906,449	$	667,048	$	2,470,131	$	1,946,889

Schedule of Revenue by Geographical Areas

The Company operates internationally, with operations mainly in the United States. The following table presents revenues by geographic location (in thousands):

	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2018		%		2017		%		2018		%		2017		%
Revenues:
Domestic	$	867,754	95.7	%	$	632,584	94.8	%	$	2,352,993	95.3	%	$	1,849,567	95.0	%
Foreign	38,695		4.3	%	34,464		5.2	%	117,138		4.7	%	97,322		5.0	%
	$	906,449	100.0	%	$	667,048	100.0	%	$	2,470,131	100.0	%	$	1,946,889	100.0	%