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Restatement and Revision of Previously Issued Financial Statements - Consolidated Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets    
Costs in excess of billings and contract loss $ 0us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear $ 11,229us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Other current assets 25,910us-gaap_OtherAssetsCurrent 19,043us-gaap_OtherAssetsCurrent
Current liabilities    
Accounts payable and accrued expenses   782,090sd_Accountspayableandaccruedexpenses
Billings and contract loss in excess of costs incurred   0us-gaap_BillingsInExcessOfCost
As Reported    
Current assets    
Costs in excess of billings and contract loss 4,079us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
 
Other current assets 21,831us-gaap_OtherAssetsCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
 
Current liabilities    
Accounts payable and accrued expenses   766,544sd_Accountspayableandaccruedexpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Billings and contract loss in excess of costs incurred   $ 15,546us-gaap_BillingsInExcessOfCost
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember