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Commitments and Contingencies - Rental Obligations (Detail) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) renewal_term | Jun. 30, 2017 USD ($) | 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 | $ 222.3 |  | 222.3 |  | $ 200.4 |  |  |  |
Financing lease obligation | 7.3 |  | 7.3 |  | 6.7 |  |  |  |
Operating Leases, Rent Expense | 2.9 | $ 2.8 | 5.7 | $ 5.6 |  |  |  |  |
Remainder of 2018 | 5.1 |  | 5.1 |  |  |  |  |  |
Operating Leases, Future Minimum Payments, 2019 | 11.1 |  | 11.1 |  |  |  |  |  |
Operating Leases, Future Minimum Payments, 2020 | 11.5 |  | 11.5 |  |  |  |  |  |
Operating Leases, Future Minimum Payments, 2021 | 11.7 |  | 11.7 |  |  |  |  |  |
Operating Leases, Future Minimum Payments, 2022 | 3.7 |  | 3.7 |  |  |  |  |  |
Thereafter | 9.4 |  | 9.4 |  |  |  |  |  |
Total | 52.5 |  | 52.5 |  |  |  |  |  |
Building (1) |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross | $ 6.0 |  | $ 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% |  |  |  |  |  |

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