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Leases - Additional Information (Detail) $ in Thousands | 1 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2007 USD ($) Building | Jun. 30, 2019 USD ($) Building RenewalOption | Dec. 31, 2018 USD ($) | May 31, 2018 USD ($) ft² | Jun. 30, 2017 USD ($) | Dec. 31, 2008 USD ($)
Leases [Line Items] |  |  |  |  |  |
Sale of facility and associated real property | $ 109,000 |  |  |  |  |
Mortgage debt retired | 47,700 |  |  |  |  |
Cash received net of transaction costs and debt retirement | $ 61,000 |  |  |  |  |
Net deferred gain on real estate sale |  |  | $ 8,000 |  |  | $ 39,100
Leaseback transaction lease period | 12 years |  |  |  |  |
Number of building leased | Building | 2 | 1 |  |  |  |
Number of vacated buildings | Building |  | 1 |  |  |  |
Letter of credit |  |  |  |  | $ 3,000 |
Number of times to renew the lease contract | RenewalOption |  | 2 |  |  |  |
Lease extension period |  | 10 years |  |  |  |
Lease description |  | At commencement of the lease, we were not reasonably certain to exercise either of the two 10-year extension options contained within the lease. |  |  |  |
Operating lease cost |  | $ 3,900 |  |  |  |
Cash paid for cashflows from operating lease |  | 3,300 |  |  |  |
Operating lease right of use asset |  | 49,085 |  |  |  |
Operating lease, liability |  | $ 69,934 |  |  |  |
Operating lease, weighted average remaining lease term |  | 10 years 3 months 18 days |  |  |  |
Operating lease, weighted average discount rate, percent |  | 6.65% |  |  |  |
Amended Lease Term |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |
Lease expiration date |  | Dec. 31, 2029 |  |  |  |
Tenant improvement allowances |  |  |  |  | $ 13,100 |
Lease Agreement |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |
Tenant improvement allowances |  |  |  | $ 4,200 |  |
Office space area leased | ft² |  |  |  | 44,718 |  |
Lease term |  |  |  | 10 years 10 months |  |
Lease Agreement | Letter of Credit |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |
Lease security deposit |  |  |  | $ 1,000 |  |

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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 Description of lessee's operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Weighted average remaining lease term for 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/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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