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Long-term Debt - Summary of Reconciliation of the Scheduled Maturities (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Debt Disclosure [Abstract] |  |
Current portion of 2018 Term Loan | $ 5,350 | $ 5,350
Current portion of discount and unamortized debt issuance costs | (2,309) | (2,321)
Total current portion of long-term debt | 3,041 | 3,029
Noncurrent portion of 2018 Term Loan | 516,275 | 518,950
Noncurrent portion of discount and unamortized debt issuance costs | (5,445) | (6,588)
Total long-term debt, net of current portion | $ 510,830 | $ 512,362

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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