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Retirement Plans - Additional Information (Detail) - USD ($)	2 Months Ended	3 Months Ended
	Feb. 28, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 29, 2016
Compensation And Retirement Disclosure [Abstract]
Employer contribution for first 3% of employee contributions		100.00%
Employer contribution for next 2% of employee contributions		50.00%
Percentage of first specified employee contributions		3.00%
Percentage of next specified employee contributions		2.00%
Contribution for retirement plan		$ 26,898	$ 24,238
Maximum amount allocated to purchase common stock under ESOP				$ 5,000,000
Number of common stock, shares purchased	682,500
Purchased common stock, value	$ 4,900,000

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Employee stock ownership plan ESOP maximum borrowing amount to purchase common stock.

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Percentage of first specified percentage of employee contribution.

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Percentage of matching contribution for first specified percentage of employee contribution.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 25
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=65888597&loc=d3e16649-113920

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Aggregate value of stock issued during the period as a result of employee stock ownership plan (ESOP).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Topic 505
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=65888597&loc=d3e16649-113920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 210
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-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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