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Employee Benefit Plans - Summary of Amounts Recognized in Statement of Financial Position (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Pension Plan [Member] |  |
Amounts Recognized in the Statement of Financial Position |  |
Noncurrent assets |  | $ 5,852
Net amount recognized |  | 5,852
Supplemental Employee Retirement Plan [Member] |  |
Amounts Recognized in the Statement of Financial Position |  |
Current liabilities | $ (512,786) | (505,169)
Noncurrent liabilities | (8,526,039) | (9,111,533)
Net amount recognized | $ (9,038,825) | $ (9,616,702)

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 3: 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(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919 + Details
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