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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
Fixed Income Funds [Member]
Defined Contribution Plan Disclosure [Line Items]
Asset Category (all Level 1)	34,141,339
Money Market Funds [Member]
Defined Contribution Plan Disclosure [Line Items]
Asset Category (all Level 1)	$ 18,062,033

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Balance Type:	debit
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X

- 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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