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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Jan. 31, 2016
USD ($)
Country
Office
Jan. 31, 2015
USD ($)
Jan. 31, 2016
USD ($)
Country
Office
Jan. 31, 2015
USD ($)
Apr. 30, 2015
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]            
Number of offices | Office   150   150    
Number of countries in which entity operates | Country   52   52    
Investments in affiliated companies maximum   50.00%   50.00%    
Deferred revenue   $ 94,000,000   $ 94,000,000   $ 40,500,000
Cash equivalents   69,900,000   69,900,000   260,600,000
Realized loss of other-than-temporary impairment   0 $ 0 0 $ 0  
Impairment of goodwill       0   0
Impairment of intangible assets       0   0
Performance related bonus expenses   41,100,000 37,800,000 128,100,000 122,100,000  
(Decrease) increase in performance related bonus expenses       (600,000) (300,000)  
Performance related bonus after reduction in the previous year estimate       127,500,000 121,800,000  
Income tax (benefit) provision $ (2,100,000) (5,355,000) $ 9,576,000 13,211,000 $ 26,392,000  
Reclassification of deferred tax assets from current to non current           $ 3,800,000
Not Designated as Hedging Instrument | Foreign Exchange Forward            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Foreign currency gain/(loss)   (400,000)        
Not Designated as Hedging Instrument | Foreign Exchange Forward | Prepaid Expenses and Other Current Assets | Derivatives Purchased            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Derivative notional amount   8,900,000   8,900,000    
Not Designated as Hedging Instrument | Foreign Exchange Forward | Prepaid Expenses and Other Current Assets | Derivatives Sold            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Derivative notional amount   $ 51,300,000   $ 51,300,000    
Minimum            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Intangible assets estimated useful lives       1 year    
Maximum            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Intangible assets estimated useful lives       24 years