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Commitments and Contingencies - Rental Obligations (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
renewal_term
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
May 01, 2016
USD ($)
ft²
Apr. 28, 2016
ft²
Feb. 01, 2016
ft²
Oct. 01, 2014
ft²
Proceeds from tenant improvement allowance $ (3.6)            
Property, Plant and Equipment, Gross 211.3   $ 200.4        
Financing lease obligation 7.4   6.7        
Operating Leases, Rent Expense 2.8 $ 2.8          
Remainder of 2018 7.7            
Operating Leases, Future Minimum Payments, 2019 11.0            
Operating Leases, Future Minimum Payments, 2020 11.4            
Operating Leases, Future Minimum Payments, 2021 11.7            
Operating Leases, Future Minimum Payments, 2022 3.7            
Thereafter 9.4            
Total 54.9            
Building (1)              
Property, Plant and Equipment, Gross $ 6.0   $ 6.0        
Property, Plant and Equipment | Building (1)              
Property, Plant and Equipment, Gross       $ 6.0      
Leased Buildings -232 South Dobson Road              
Lessee Leasing Arrangements, Operating Leases, Number of Renewal Term | renewal_term 4            
Lessee, Operating Lease, Renewal Term 5 years            
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive              
Lessee Leasing Arrangements, Operating Leases, Number of Renewal Term | renewal_term 2            
Lessee, Operating Lease, Renewal Term 5 years            
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive              
Leased Square Footage | ft²             219,000
Leased Buildings -6350 Sequence Drive              
Leased Square Footage | ft²           132,600  
Leased Buildings -232 South Dobson Road              
Leased Square Footage | ft²       78,000 148,797    
Leased Buildings -232 South Dobson Road | Other Noncurrent Liabilities              
Financing lease obligation       $ 6.0      
Maximum              
Annual rent potential rate adjustment 4.00%            
Minimum              
Annual rent potential rate adjustment 2.50%