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Leases - Additional Information (Detail) $ in Thousands | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2019 USD ($) ft² RenewalOption | Dec. 31, 2007 USD ($) Building | Sep. 30, 2019 USD ($) Building | Dec. 31, 2018 USD ($) | May 31, 2018 USD ($) ft² | Dec. 31, 2008 USD ($)
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
Lease back transaction lease period |  | 12 years |  |  |  |
Number of building leased | Building |  | 2 | 1 |  |  |
Number of vacated buildings | Building |  | 1 |  |  |  |
Lessee operating lease term of contract | 12 years |  |  |  |  |
Restricted cash |  |  | $ 4,706 | $ 5,477 |  |
Number of times to renew the lease contract | RenewalOption | 2 |  |  |  |  |
Lease extension period | 10 years |  |  |  |  |
Lease description | The 2019 amendment includes two options to extend the term of the lease for a period of 10 years each. We were not reasonably certain to exercise either of these options at lease commencement. |  |  |  |  |
Deposits |  |  | 700 |  |  |
Operating lease cost |  |  | 5,900 |  |  |
Cash paid for cashflows from operating lease |  |  | 5,500 |  |  |
Operating lease right of use asset |  |  | 61,987 |  |  |
Operating lease, liability |  |  | $ 82,641 |  |  |
Operating lease, weighted average remaining lease term |  |  | 11 years 5 months 4 days |  |  |
Operating lease, weighted average discount rate, percent |  |  | 5.84% |  |  |
Letter of Credit |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |
Restricted cash | $ 3,000 |  |  |  |  |
Amended Lease Term |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |
Lease expiration date | Jul. 31, 2031 | Dec. 31, 2029 |  |  |  |
Office space area leased | ft² | 80,282 |  |  |  |  |
Lease Agreement |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |
Office space area leased | ft² |  |  |  |  | 44,718 |
Lessee operating lease term of contract |  |  |  |  | 10 years 10 months |
Tenant improvement allowances |  |  |  |  | $ 4,200 |
Lease Agreement | Letter of Credit |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |
Restricted cash |  |  |  |  | $ 1,000 |

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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 cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=116631420&loc=SL116631458-115580 + Details
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