SEGMENT DATA - Information on Operating Segments and Reconciliation to Loss From Operations (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		$ 228,488,000	$ 214,988,000	$ 645,374,000	$ 611,014,000
Contribution income		22,002,000	21,718,000	58,433,000	59,684,000
Unallocated corporate overhead		9,301,000	9,449,000	30,414,000	29,608,000
Depreciation and amortization		2,849,000	2,092,000	7,325,000	6,969,000
Acquisition-related contingent consideration		(605,000)	237,000	(54,000)	707,000
Acquisition and integration costs		1,366,000	0	1,953,000	0
Restructuring costs		724,000	611,000	724,000	611,000
Impairment charges		0	0	0	24,311,000	$ 0
Income (loss) from operations		8,367,000	9,329,000	18,071,000	(2,522,000)
Nurse and allied staffing [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		200,492,000	186,623,000	564,527,000	527,436,000
Contribution income		20,663,000	19,472,000	54,426,000	53,877,000
Physician staffing [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		24,871,000	25,090,000	71,055,000	73,470,000
Contribution income		1,340,000	2,400,000	4,207,000	6,003,000
Impairment charges	$ 24,300,000
Other human capital management services [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues		3,125,000	3,275,000	9,792,000	10,108,000
Contribution income		$ (1,000)	$ (154,000)	$ (200,000)	$ (196,000)