Employee Benefits - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Profit sharing contribution	3.00%	2.75%	2.75%
Company match of participant contributions	50.00%
Maximum annual compensation contribution	2.00%
Expense under plan	$ 338	$ 304	$ 269
Stock options granted	0	0	0
Stock options vested	0	0	0
Stock option plan expire year	2013
Options outstanding	0	5,952	11,904	30,760
Total intrinsic value of stock options and outstanding		$ 39
Total intrinsic value of exercisable stock options		$ 39

Four zero one K profit sharing plan expense.

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- Definition

Percentage maximum employers contribution on participants contribution under profit sharing plan.

+ References

No definition available.

+ Details

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- Definition

Percentage of matching contribution under compensation plan.

+ References

No definition available.

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- Definition

Percentage profit sharing contribution of eligible participants compensation.

+ References

No definition available.

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- Definition

Stock option plan expiration year.

+ References

No definition available.

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- References

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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