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Leases - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Lessee, Lease, Description [Line Items] |  |  |  |  |
Right-of-use assets | $ 48,200 |  | $ 48,200 |  | $ 52,200
Total lease liabilities - Operating leases | $ 51,670 |  | $ 51,670 |  | $ 54,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Accrued expenses and other liabilities |  | Accrued expenses and other liabilities |  | Accrued expenses and other liabilities
Weighted average remaining lease term | 8 years 3 days |  | 8 years 3 days |  | 8 years 9 months
Weighted average discount rate (percent) | 2.38% |  | 2.38% |  | 2.43%
Net lease expense | $ 2,300 | $ 2,000 | $ 6,300 | $ 6,100 |
Operating lease costs | 2,000 | 2,000 | 6,100 | 6,100 |
Cash paid for amounts included in the measurement of Company's operating lease liabilities | $ 1,900 | $ 1,700 | $ 6,000 | $ 5,600 |
Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease remaining term | 1 year |  | 1 year |  |
Finance lease remaining term | 1 year |  | 1 year |  |
Maximum [Member] |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease remaining term | 13 years |  | 13 years |  |
Finance lease remaining term | 13 years |  | 13 years |  |
Operating lease extension term | 5 years |  | 5 years |  |
Finance lease extension term | 5 years |  | 5 years |  |

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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: 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=123414884&loc=SL77918982-209971 + Details
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- Definition Remaining lease term of finance 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)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Term of lessee's finance lease renewal, 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=123408670&loc=SL77918673-209980 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + 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=123414884&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 (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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