Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2017

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									Three Months Ended
	June 30, 2017									June 30, 2016
	Apex		Oxford		Corporate⁽¹⁾			Total		Apex		Oxford		Corporate⁽¹⁾			Total
Revenues	$	502,455	$	150,858	$	—		$	653,313	$	453,723	$	154,365	$	—		$	608,088
Gross profit	150,223		62,714		—			212,937		138,165		63,921		—			202,086
Operating income	56,770		14,774		(12,083		)	59,461		50,190		13,856		(13,342		)	50,704
Amortization	7,262		1,037		—			8,299		8,590		1,442		—			10,032



	Six Months Ended									Six Months Ended
	June 30, 2017									June 30, 2016
	Apex		Oxford		Corporate⁽¹⁾			Total		Apex		Oxford		Corporate⁽¹⁾			Total
Revenues	$	984,970	$	294,871	$	—		$	1,279,841	$	886,878	$	303,250	$	—		$	1,190,128
Gross profit	290,142		120,939		—			411,081		264,309		125,559		—			389,868
Operating income	103,663		23,437		(24,031		)	103,069		90,176		26,616		(28,331		)	88,461
Amortization	14,789		1,974		—			16,763		17,180		2,996		—			20,176


(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.

Revenue by Type [Table Text Block]

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



	Three Months Ended								Six Months Ended
	June 30,								June 30,
	2017		%		2016		%		2017		%		2016		%
Revenues:
Assignment	$	620,014	94.9	%	$	574,323	94.4	%	$	1,214,529	94.9	%	$	1,123,875	94.4	%
Permanent placement	33,299		5.1	%	33,765		5.6	%	65,312		5.1	%	66,253		5.6	%
	$	653,313	100.0	%	$	608,088	100.0	%	$	1,279,841	100.0	%	$	1,190,128	100.0	%

Schedule of Revenue by Geographical Areas

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



	Three Months Ended								Six Months Ended
	June 30,								June 30,
	2017		%		2016		%		2017		%		2016		%
Revenues:
Domestic	$	620,682	95.0	%	$	578,165	95.1	%	$	1,216,983	95.1	%	$	1,132,603	95.2	%
Foreign	32,631		5.0	%	29,923		4.9	%	62,858		4.9	%	57,525		4.8	%
	$	653,313	100.0	%	$	608,088	100.0	%	$	1,279,841	100.0	%	$	1,190,128	100.0	%