Segment Information - Summary of Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 595,551
Reallocation due to change in segments	0
Goodwill, ending balance	851,459
Accumulated impairment loss	214,939	$ 214,939
Nurse and Allied Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	344,316
Reallocation due to change in segments	(14,600)
Goodwill, ending balance	329,716
Accumulated impairment loss	154,444	154,444
Physician and Leadership Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	163,348
Reallocation due to change in segments	297
Goodwill, ending balance	163,645
Accumulated impairment loss	60,495	60,495
Technology and Workforce Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	87,887
Reallocation due to change in segments	14,303
Goodwill, ending balance	358,098
Accumulated impairment loss	0	$ 0
b4health
Goodwill [Roll Forward]
Goodwill adjustment for b4health acquisition	(66)
b4health \| Nurse and Allied Solutions
Goodwill [Roll Forward]
Goodwill adjustment for b4health acquisition	0
b4health \| Physician and Leadership Solutions
Goodwill [Roll Forward]
Goodwill adjustment for b4health acquisition	0
b4health \| Technology and Workforce Solutions
Goodwill [Roll Forward]
Goodwill adjustment for b4health acquisition	(66)
Stratus Video
Goodwill [Roll Forward]
Goodwill from Stratus Video acquisition	255,974
Stratus Video \| Nurse and Allied Solutions
Goodwill [Roll Forward]
Goodwill from Stratus Video acquisition	0
Stratus Video \| Physician and Leadership Solutions
Goodwill [Roll Forward]
Goodwill from Stratus Video acquisition	0
Stratus Video \| Technology and Workforce Solutions
Goodwill [Roll Forward]
Goodwill from Stratus Video acquisition	$ 255,974

Goodwill, Change In Goodwill Allocation

No definition available.

Name:	amn_GoodwillChangeInGoodwillAllocation
Namespace Prefix:	amn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillPurchaseAccountingAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=amn_NurseAndAlliedHealthcareStaffingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=amn_PhysicianAndLeadershipSolutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=amn_TechnologyAndWorkforceSolutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=amn_B4healthLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=amn_StratusVideoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: