Segment Data (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue from services	$ 222,523	$ 214,988	$ 199,443	$ 196,583	$ 193,148	$ 195,692	$ 192,617	$ 185,964	$ 833,537	$ 767,421	$ 617,825
Contribution income									79,722	67,794	43,540
Unallocated corporate overhead									38,400	32,703	27,770
Depreciation									4,168	3,856	3,866
Amortization									5,014	4,210	3,575
Loss on sale of business									0	2,184	0
Acquisition and integration costs									78	902	7,957
Acquisition-related contingent consideration									814	0	0
Restructuring costs									753	1,274	840
Impairment charges			24,300		$ 2,100				24,311	2,100	10,000
Income (loss) from operations									6,184	20,565	(10,468)
Physician Staffing Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Impairment charges			$ 24,300
Operating Segments | Nurse and Allied Staffing Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue from services									721,486	621,258	459,195
Contribution income									71,992	55,718	36,486
Operating Segments | Physician Staffing Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue from services									98,283	115,336	121,145
Contribution income									8,265	10,213	6,540
Operating Segments | Other Human Capital Management Services Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue from services									13,768	30,827	37,485
Contribution income									$ (535)	$ 1,863	$ 514