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Leases - Additional Information (Detail) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Dec. 31, 2007 USD ($) Building | Dec. 31, 2018 USD ($) Building RenewalOption | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 31, 2018 USD ($) ft² | Dec. 31, 2008 USD ($)
Leases [Line Items] |  |  |  |  |  |  |
Sale of facility and associated real property |  | $ 109.0 |  |  |  |  |
Mortgage debt retired |  | 47.7 |  |  |  |  |
Cash received net of transaction costs and debt retirement |  | $ 61.0 |  |  |  |  |
Net deferred gain on real estate sale |  |  | $ 7.3 |  |  |  | $ 39.1
Deferred gain recognized on real estate sale |  |  | $ 0.7 | $ 2.1 | $ 3.4 |  |
Leaseback transaction lease period |  | 12 years |  |  |  |  |
Number of building leased | Building |  | 2 | 1 |  |  |  |
Number of vacated buildings | Building |  |  | 1 |  |  |  |
Percentage of management fee included in the base annual rent | 3.50% |  |  |  |  |  |
Lease security deposit | $ 4.7 |  |  |  |  |  |
Letter of credit | $ 3.0 |  |  |  |  |  |
Number of times to renew the lease contract | RenewalOption |  |  | 2 |  |  |  |
Lease extension period |  |  | 10 years |  |  |  |
Rent expense |  |  | $ 6.9 | $ 5.9 | $ 6.0 |  |
Amended Lease Term |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |
Lease expiration date |  |  | Dec. 31, 2029 |  |  |  |
Percentage reduction in base rental | 8.00% |  |  |  |  |  |
Tenant improvement allowances | $ 13.1 |  |  |  |  |  |
Lease security deposit | $ 3.0 |  |  |  |  |  |
Lease Agreement |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |
Tenant improvement allowances |  |  |  |  |  | $ 4.2 |
Office space area leased | ft² |  |  |  |  |  | 44,718 |
Lease term |  |  |  |  |  | 10 years 10 months |
Lease Agreement | Letter of Credit |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |
Lease security deposit |  |  |  |  |  | $ 1.0 |

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- Definition Letter of credit issued by the bank in lieu of a cash security deposit under the terms of a lease, secured by a deposit of equal amount with that bank. + References No definition available. + Details
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- Definition The term whereby the Company leased back the property in a sale leaseback transaction involving the sale of the property to another party and the lease of the property back to the Company, in PnY format. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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