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Related Party Transactions - Narrative (Detail) - USD ($)
$ in Millions
2 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]          
Revenue from related parties     $ 11.8 $ 17.8 $ 3.9
Account receivable due from related parties $ 0.6 $ 2.0 0.6 2.0  
InteliStaf [Member]          
Related Party Transaction [Line Items]          
Revenue from related parties   4.7 $ 10.0    
Percent ownership in joint venture 68.00%   68.00%    
Receivable balance with joint venture $ 1.4 0.9 $ 1.4 0.9  
Payable balance with joint venture 0.2 $ 0.1 $ 0.2 $ 0.1  
Affiliated Entity [Member]          
Related Party Transaction [Line Items]          
Rent expense $ 0.1