Financial Instruments - Valuation Technique and Unobservable Inputs (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Assets Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 16,069	$ 2,224
Assets Approach [Member] \| Minimum [Member] \| Over the Counter [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Over-the-counter trading activity	$ 0	$ 0
Assets Approach [Member] \| Maximum [Member] \| Over the Counter [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Over-the-counter trading activity	14.10	34.00
Assets Approach [Member] \| Weighted Average [Member] \| Over the Counter [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Over-the-counter trading activity	$ 11.13	$ 11.56
Black-Scholes - Assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 436	$ 964
Volatility	30.00%	30.00%
Dividend Yield	0.00%	0.00%
Interest Rate	1.90%	2.10%
Volatility, Weighted Average	30.00%	30.00%
Black-Scholes - Assets [Member] \| Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Dividend Yield	0.00%	0.00%
Interest Rate	1.90%	2.10%

Assets fair value per share.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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- Definition

Weighted average expected volatility of stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ 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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