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Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Components of Long-Term Debt [Abstract] |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | $ 217,234 |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 137,252 |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 136,781 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 806,383 |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 89,194 |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 272,167 |
Secured Long-term Debt, Noncurrent | 1,659,011 | $ 1,421,853
Debt Issuance Costs, Net | $ 23,500 | $ 23,600

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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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