Risk that one party to the contract will default expressed as a percentage, used as an input to measure fair value.

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

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Fair value of financial and nonfinancial obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Fair Value - Quantitative Information About Recurring Level 3 Fair Value Measurements (Detail) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value	$ 85,721	$ 92,517
Fair Value on Recurring Basis \| Industrial revenue bonds \| Discounted Cash Flow
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value	$ 3,249	$ 3,437
Illiquidity factor	0.50%	0.50%
Fair Value on Recurring Basis \| Industrial revenue bonds \| Discounted Cash Flow \| Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate	2.89%		3.75%
Fair Value on Recurring Basis \| Industrial revenue bonds \| Discounted Cash Flow \| Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate	3.04%		3.78%