Background and Basis of Presentation - Narrative (Details)	12 Months Ended
Dec. 31, 2014 product_category	Dec. 31, 2014 product segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	2us-gaap_NumberOfOperatingSegments	2us-gaap_NumberOfOperatingSegments
Number of major product categories	2imn_NumberofMajorProductCategories	4imn_NumberofMajorProductCategories
Number of reporting segments	2us-gaap_NumberOfReportableSegments	2us-gaap_NumberOfReportableSegments

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration