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Contingencies - Additional Information (Detail)
 1 Months Ended
Apr. 26, 2015
Jan. 13, 2014
USD ($)
Dec. 23, 2013
USD ($)
Dec. 21, 2013
USD ($)
Jan. 24, 2013
USD ($)
Aug. 11, 2011
USD ($)
Aug. 31, 2011
USD ($)
Apr. 30, 2011
USD ($)
trade_secret
Jan. 31, 2010
USD ($)
Jun. 30, 2006
Case
Apr. 30, 1999
USD ($)
Sep. 30, 2017
USD ($)
Jun. 27, 2017
stockholder
Nov. 11, 2014
USD ($)
Jul. 26, 2013
USD ($)
Dec. 31, 2012
USD ($)
Apr. 27, 2009
USD ($)
Jul. 17, 2008
USD ($)
Loss Contingencies [Line Items]                                    
Number of stockholders who filed lawsuits | stockholder                         2          
MGA                                    
Loss Contingencies [Line Items]                                    
Number of cases combined (in case) | Case                   3                
Historical jury verdict                                 $ 100,000,000 $ 100,000,000
Claimed trade secrets (in trade secret) | trade_secret               26                    
Compensatory damages awarded by jury               $ 88,500,000.0                    
Other claimed trade secrets | trade_secret               88                    
Reduced compensatory damages awarded by court             $ 85,000,000.0                      
Punitive damages awarded             85,000,000.0                      
Attorney fees and costs awarded             140,000,000                      
Compensatory damages, punitive damages, and attorney fees and costs awarded by court             $ 310,000,000                      
Damages for alleged trade secret misappropriation appealed           $ 170,000,000                        
Attorney fees and costs appealed           $ 140,000,000                        
Amount of damages and attorney's fees and costs vacated by the appeals court         $ 172,500,000                          
Litigation accrual                               $ 138,000,000    
Approximate amount of judgment finalized in the District Court, including interest       $ 138,000,000                            
Payment of judgment     $ 138,000,000                              
Reasonably possible range of pre-judgment interest, minimum                       $ 0            
Reasonably possible range of pre-judgment interest, maximum                       12,000,000            
Accrued litigation liability                       0            
Yellowstone                                    
Loss Contingencies [Line Items]                                    
Alleged loss of profits                     $ 1,000,000              
Unpaid accounts receivable                     4,000,000              
Alleged business investments                     3,000,000              
Initial estimate of loss of profits                     $ 1,000,000              
Court awarded damages from counterclaim                 $ 4,000,000                  
Damages awarded, including attorney fees, inflation and interest                             $ 17,000,000      
Counter claim awarded, including inflation                       7,500,000   $ 7,500,000 $ 7,500,000      
Damages award including inflation and interest                           $ 14,500,000        
Percent fine on claims 1.00%                                  
Minimum | MGA                                    
Loss Contingencies [Line Items]                                    
Alleged trade secrets damages claimed (more than)   $ 1,000,000,000                                
Loss contingency, estimate of possible loss                       0            
Minimum | Yellowstone                                    
Loss Contingencies [Line Items]                                    
Loss contingency, estimate of possible loss                       0            
Maximum | MGA                                    
Loss Contingencies [Line Items]                                    
Loss contingency, estimate of possible loss                       12,500,000            
Maximum | Yellowstone                                    
Loss Contingencies [Line Items]                                    
Loss contingency, estimate of possible loss                       $ 18,500,000