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Segment Reporting (Segment Reporting Information) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)
Revenues:
Revenues	$ 572,123	$ 442,443	$ 1,487,491	$ 1,283,718
Revenue as Percentage of Consolidated Revenue	100.00%	100.00%	100.00%	100.00%
Gross Profit:
Total Gross Profit	$ 191,404	$ 144,838	$ 485,813	$ 414,898
Operating Income (Loss):
Total Operating Income	51,465	38,698	109,246	101,975
Amortization of Intangible Assets	11,325	5,532	$ 23,151	16,592
Reportable segments (in number of segments) | segment			2
Corporate Segment [Member]
Operating Income (Loss):
Total Operating Income	(15,937)	(14,102)	$ (49,870)	(39,951)
Amortization of Intangible Assets	0	0	0	8
Apex
Revenues:
Revenues	421,067	306,027	1,054,064	882,328
Gross Profit:
Total Gross Profit	128,731	87,323	306,026	247,506
Operating Income (Loss):
Total Operating Income	48,119	33,735	105,258	88,227
Amortization of Intangible Assets	9,732	4,089	18,638	12,267
Oxford
Revenues:
Revenues	151,056	136,416	433,427	401,390
Gross Profit:
Total Gross Profit	62,673	57,515	179,787	167,392
Operating Income (Loss):
Total Operating Income	19,283	19,065	53,858	53,699
Amortization of Intangible Assets	1,593	1,443	4,513	4,317
Physician Segment [Member]
Operating Income (Loss):
Total Operating Income		276		1,042
Domestic [Member]
Revenues:
Revenues	$ 546,747	$ 421,640	$ 1,420,492	$ 1,223,217
Revenue as Percentage of Consolidated Revenue	95.60%	95.30%	95.50%	95.30%
Assignment [Member]
Revenues:
Revenues	$ 539,383	$ 419,990	$ 1,402,116	$ 1,220,800
Revenue as Percentage of Consolidated Revenue	94.30%	94.90%	94.30%	95.10%
Direct hire and conversion fees [Member]
Revenues:
Revenues	$ 32,740	$ 22,453	$ 85,375	$ 62,918
Revenue as Percentage of Consolidated Revenue	5.70%	5.10%	5.70%	4.90%

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