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Summary of Operations and Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Unit
Segment
Dec. 31, 2012
Dec. 31, 2011
Mar. 01, 2010
Ecole Insurance Company [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2013
Minimum [Member]
ACE [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2013
Maximum [Member]
ACE [Member]
Basis Of Presentation Of Interim Period Statements [Line Items]                    
Revenue from attributable to geographic area 74.00% 69.00% 61.00%              
Workers Compensation Coverage Per Occurrence             $ 1,000,000     $ 5,000,000
Restricted capital 11,205,000 9,726,000   6,100,000            
Operating and reporting segment 1                  
Revenue recognition professional employer services contracts term 1 year                  
Professional employer service contract cancellation and termination period 30 days                  
Cash and cash equivalents, maturity term 3 months                  
Cash and cash equivalents exceeded federally insured limits Value 92,600,000                  
Restricted marketable securities maturity period         180 days 180 days   2 years 2 years  
Likelihood of tax benefit being realized upon settlement 50.00%                  
Number of reporting unit 1                  
Goodwill and intangible assets impairment 0                  
Income taxes paid $ 9,000,000 $ 3,300,000 $ 4,700,000