Number of share exceeding annual award limit

No definition available.

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- Definition

Number of shares limit on compensation plan.

+ References

No definition available.

+ Details

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- Definition

Restricted share award closing prices per share minimum.

+ References

No definition available.

+ Details

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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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.

+ Details

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- Definition

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

+ 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 (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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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

+ Details

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Period Type:	instant

- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Number of options vested.

+ References

No definition available.

+ Details

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- Details

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Stock-Based Compensation - Additional Information (Detail) - $ / shares				3 Months Ended	6 Months Ended	12 Months Ended
	Feb. 26, 2016	Feb. 28, 2015	Jan. 31, 2015	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares limit on compensation plan						112,000
Number of shares exceeding annual award limit	112,000
Options granted exercise price	$ 55.62
Stock based compensation, option grant vested	13,200
Restricted share award closing prices range per share, Minimum	$ 75				$ 36
January 28, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	13,200
January 28, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	13,600
Mr Albright [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted share award closing prices range per share, Minimum				$ 60
2010 Plan [Member] \| Mr Albright [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares limit on compensation plan					50,000
Number of shares exceeding annual award limit					112,000
2010 Plan [Member] \| Mr Albright [Member] \| Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation, Shares, Granted	4,000		8,000	94,000			96,000	96,000
2010 Plan [Member] \| Mr Albright [Member] \| Restricted Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation, Shares, Granted	4,000
2010 Plan [Member] \| Mr Albright [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation, Shares, Granted	40,000	20,000		40,000