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Business Combinations (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 03, 2016
USD ($)
Jan. 11, 2016
USD ($)
Jan. 04, 2016
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
aquisition
Business Acquisition [Line Items]                  
Number of acquisitions | aquisition                 3
Business Combination, Description                  
Additional cash consideration paid             $ 1,000,000 $ 1,348,000  
Earn-out payments for prior acquisitions             3,677,000 $ 900,000  
Allocation of Purchase Price                  
Goodwill             340,596,000   $ 341,754,000
Nurse and Allied Solutions                  
Allocation of Purchase Price                  
Goodwill             103,107,000   104,306,000
Other Workforce Solutions                  
Allocation of Purchase Price                  
Goodwill             $ 217,746,000   $ 217,705,000
Peak                  
Business Combination, Description                  
Total purchase price of the acquisition $ 52,400,000                
Cash consideration 51,645,000                
Contingent earn-out based on future operating performance 3,000,000                
Fair value of contingent earn-out 480,000                
Additional cash consideration paid         $ 275,000        
Allocation of Purchase Price                  
Fair value of assets acquired 5,658,000                
Liabilities assumed 9,346,000                
Identified intangible assets $ 19,220,000                
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Weighted average useful life of intangible assets 13 years                
Peak | Other Workforce Solutions                  
Allocation of Purchase Price                  
Goodwill $ 36,868,000                
Peak | Trademarks                  
Allocation of Purchase Price                  
Identified intangible assets 7,600,000                
Peak | Customer Relationships                  
Allocation of Purchase Price                  
Identified intangible assets 11,500,000                
Peak | Scenario, Previously Reported                  
Business Combination, Description                  
Total purchase price of the acquisition $ 52,125,000                
HSG                  
Business Combination, Description                  
Total purchase price of the acquisition   $ 8,219,000              
Cash consideration   2,799,000              
Contingent earn-out based on future operating performance   4,000,000              
Fair value of contingent earn-out   3,590,000              
Indemnification assets, amount as of acquisition date   2,122,000              
Working capital settlement received         $ 292,000        
Allocation of Purchase Price                  
Fair value of assets acquired   1,025,000              
Liabilities assumed   3,698,000              
Identified intangible assets   $ 3,944,000              
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Weighted average useful life of intangible assets   8 years              
HSG | Nurse and Allied Solutions                  
Allocation of Purchase Price                  
Goodwill   $ 6,948,000              
HSG | Scenario, Previously Reported                  
Business Combination, Description                  
Total purchase price of the acquisition   8,511,000              
HSG | Earn-Out Payment, Based on Operating Results for 2016                  
Business Combination, Description                  
Contingent earn-out based on future operating performance   2,000,000              
Earn-out payments for prior acquisitions       $ 1,930,000          
HSG | Earn-Out Payment, Based on Operating Results for 2017                  
Business Combination, Description                  
Contingent earn-out based on future operating performance   $ 2,000,000              
BES                  
Business Combination, Description                  
Cash consideration     $ 161,708,000            
Working capital settlement received           $ 524,000      
Allocation of Purchase Price                  
Fair value of assets acquired     11,953,000            
Liabilities assumed     7,272,000            
Identified intangible assets     $ 65,900,000            
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Weighted average useful life of intangible assets     15 years            
BES | Other Workforce Solutions                  
Allocation of Purchase Price                  
Goodwill     $ 91,127,000            
BES | Tradenames and Trademarks                  
Allocation of Purchase Price                  
Identified intangible assets     $ 26,300,000            
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Useful life     20 years            
BES | Customer Relationships                  
Allocation of Purchase Price                  
Identified intangible assets     $ 25,700,000            
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Useful life     12 years            
BES | Staffing Database                  
Allocation of Purchase Price                  
Identified intangible assets     $ 13,000,000            
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Useful life     10 years            
BES | Non-Compete Agreements                  
Allocation of Purchase Price                  
Identified intangible assets     $ 900,000            
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Useful life     5 years            
BES | Scenario, Previously Reported                  
Business Combination, Description                  
Cash consideration     $ 162,232,000            
BES | Line of Credit                  
Business Combination, Description                  
Maximum borrowing capacity     $ 125,000,000