For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.9)

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.5)

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

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-Name Accounting Standards Codification

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Section S99

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-Subparagraph (SX 210.5-03.1)

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Industry and Geographic Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			6 Months Ended		3 Months Ended	6 Months Ended			3 Months Ended	12 Months Ended
	Jun. 30, 2014 Segment	Jun. 30, 2014 Sales [Member]	Jun. 30, 2014 Customer Concentration Risk [Member] Non-U.S. Customers [Member]	Jun. 30, 2013 Customer Concentration Risk [Member] Non-U.S. Customers [Member]	Dec. 31, 2013 Customer Concentration Risk [Member] Non-U.S. Customers [Member]	Jun. 30, 2014 Customer Concentration Risk [Member] Sales [Member]	Jun. 30, 2013 Customer Concentration Risk [Member] Sales [Member]	Jun. 30, 2013 Customer Concentration Risk [Member] Sales [Member] Non-U.S. Customers [Member]	Jun. 30, 2014 Customer Concentration Risk [Member] Sales [Member] Non-U.S. Customers [Member]	Jun. 30, 2014 Credit Concentration Risk [Member]	Dec. 31, 2013 Credit Concentration Risk [Member]	Jun. 30, 2014 Credit Concentration Risk [Member] Accounts receivable [Member] Minimum [Member]	Dec. 31, 2013 Credit Concentration Risk [Member] Accounts receivable [Member] Minimum [Member]
Revenue, Major Customer [Line Items]
Number of reportable segments	1
Percentage of risk concentration by major customer		10.00%				22.00%	26.00%	14.00%	17.00%			10.00%	10.00%
Sales to customers outside the U.S.			$ 13.0	$ 12.7
Accounts receivable			$ 3.9		$ 3.2					$ 1.7	$ 19.6