Supplementary Financial Information (Other Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Pooled patents agreement receivable	$ 0	$ 6,000
Other	5,446us-gaap_OtherAssetsMiscellaneous	6,112us-gaap_OtherAssetsMiscellaneous
Total	$ 5,446sqnm_IntangibleAssetsandOtherAssets	$ 12,112sqnm_IntangibleAssetsandOtherAssets

Amount before accumulated amortization of intangible assets, excluding goodwill.

No definition available.

Name:	us-gaap_IntangibleAssetsGrossExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant