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Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2014
Dec. 31, 2015
Mar. 31, 2015
Overnight Holdings        
Money market funds (cash equivalents) $ 300,980   $ 247,720  
Investment Holdings        
Money market funds (cash equivalents) 9,739   26,048  
Marketable securities 1,894   9,875  
Total cash equivalents and marketable securities 312,613   283,643  
Cash held in demand accounts 20,942   19,377  
Outstanding checks (12,813)   (23,607)  
Total cash, cash equivalents and marketable securities 320,742   279,413  
Cash and cash equivalents 318,848 $ 276,456 269,538 $ 228,588
Marketable securities 1,894   9,875  
Withholding associated with federal and state income taxes, employment taxes and other payroll deductions included in cash balance 181,100   185,700  
Client prepayments included in cash balance 99,200   17,000  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 310,719   273,768  
Municipal bonds 1,894   9,875  
Total 312,613   283,643  
Available-for-sale marketable securities [Abstract]        
Amortized Cost 1,892   9,875  
Gross Unrealized Gains 2 3    
Gross Unrealized Losses 0 $ (3)    
Municipal bonds 1,894   9,875  
Contractual maturities amortized cost [Abstract]        
Less than one year 1,359      
One to five years 533      
Amortized Cost 1,892   9,875  
Contractual maturities estimated fair value [Abstract]        
Less than one year 1,359      
One to five years 535      
Municipal bonds 1,894   9,875  
Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 310,719   273,768  
Municipal bonds 0   0  
Total 310,719   273,768  
Available-for-sale marketable securities [Abstract]        
Municipal bonds 0   0  
Contractual maturities estimated fair value [Abstract]        
Municipal bonds 0   0  
Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 0   0  
Municipal bonds 1,894   9,875  
Total 1,894   9,875  
Available-for-sale marketable securities [Abstract]        
Municipal bonds 1,894   9,875  
Contractual maturities estimated fair value [Abstract]        
Municipal bonds 1,894   9,875  
Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 0   0  
Municipal bonds 0   0  
Total 0   0  
Available-for-sale marketable securities [Abstract]        
Municipal bonds 0   0  
Contractual maturities estimated fair value [Abstract]        
Municipal bonds $ 0   $ 0