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Employee Benefit Plans - Schedule of Asset Category (Detail) - Pension Plan [Member] - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Asset Category (all Level 1)	$ 52,203,372	$ 83,868,508
U.S. Equity Funds [Member]
Defined Contribution Plan Disclosure [Line Items]
Asset Category (all Level 1)		8,764,507
International Equity Funds [Member]
Defined Contribution Plan Disclosure [Line Items]
Asset Category (all Level 1)		15,489,743
Fixed Income Funds [Member]
Defined Contribution Plan Disclosure [Line Items]
Asset Category (all Level 1)	34,141,339	$ 59,614,258
Money Market Funds [Member]
Defined Contribution Plan Disclosure [Line Items]
Asset Category (all Level 1)	$ 18,062,033

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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