1.0.0.3 false Consolidated Condensed Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data false 1 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 3 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 4 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 5 Revenues: 3 us-gaap_RevenuesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 6 Oilfield operations 4 sii_OilfieldOperations sii false credit duration monetary Oilfield operations. false false false false false false false false false 1 true true 1533483000 1533483 false false 2 true true 1878570000 1878570 false false 3 true true 3375220000 3375220 false false 4 true true 3681497000 3681497 false false Oilfield operations. No authoritative reference available. false 7 Distribution operations 4 sii_DistributionOperations sii false credit duration monetary Distribution operations. false false false false false false false false false 1 false true 410806000 410806 false false 2 false true 615588000 615588 false false 3 false true 980548000 980548 false false 4 false true 1183659000 1183659 false false Distribution operations. No authoritative reference available. true 8 Total revenues 4 us-gaap_OilAndGasSalesRevenue us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1944289000 1944289 false false 2 false true 2494158000 2494158 false false 3 false true 4355768000 4355768 false false 4 false true 4865156000 4865156 false false No definition available. No authoritative reference available. true 9 Costs and expenses: 3 us-gaap_CostsAndExpensesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 10 Cost of oilfield revenues 4 sii_CostOfOilfieldRevenues sii false debit duration monetary Cost of oilfield revenues. false false false false false false false false false 1 false true 1052644000 1052644 false false 2 false true 1178365000 1178365 false false 3 false true 2281835000 2281835 false false 4 false true 2297868000 2297868 false false Cost of oilfield revenues. No authoritative reference available. false 11 Cost of distribution revenues 4 sii_CostOfDistributionRevenues sii false debit duration monetary Cost of distribution revenues. false false false false false false false false false 1 false true 362615000 362615 false false 2 false true 508341000 508341 false false 3 false true 852601000 852601 false false 4 false true 978352000 978352 false false Cost of distribution revenues. No authoritative reference available. false 12 Selling, general and administrative expenses 4 us-gaap_SellingGeneralAndAdministrativeExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 395726000 395726 false false 2 false true 417685000 417685 false false 3 false true 846350000 846350 false false 4 false true 820362000 820362 false false No definition available. No authoritative reference available. true 13 Total costs and expenses 4 us-gaap_CostsAndExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1810985000 1810985 false false 2 false true 2104391000 2104391 false false 3 false true 3980786000 3980786 false false 4 false true 4096582000 4096582 false false No definition available. No authoritative reference available. true 14 Operating income 3 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 133304000 133304 false false 2 false true 389767000 389767 false false 3 false true 374982000 374982 false false 4 false true 768574000 768574 false false No definition available. No authoritative reference available. false 15 Interest expense 3 us-gaap_InterestExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 42803000 42803 false false 2 false true 16244000 16244 false false 3 false true 70327000 70327 false false 4 false true 32545000 32545 false false No definition available. No authoritative reference available. false 16 Interest income 3 us-gaap_InvestmentIncomeInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -729000 -729 false false 2 false true -752000 -752 false false 3 false true -1087000 -1087 false false 4 false true -1648000 -1648 false false No definition available. No authoritative reference available. true 17 Income before income taxes and noncontrolling interests 3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 91230000 91230 false false 2 false true 374275000 374275 false false 3 false true 305742000 305742 false false 4 false true 737677000 737677 false false No definition available. No authoritative reference available. false 18 Income tax provision 3 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 27957000 27957 false false 2 false true 121555000 121555 false false 3 false true 98275000 98275 false false 4 false true 238846000 238846 false false No definition available. No authoritative reference available. true 19 Net income 3 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 63273000 63273 false false 2 false true 252720000 252720 false false 3 false true 207467000 207467 false false 4 false true 498831000 498831 false false No definition available. No authoritative reference available. false 20 Noncontrolling interests in net income of subsidiaries 3 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 38887000 38887 false false 2 false true 69447000 69447 false false 3 false true 86146000 86146 false false 4 false true 140567000 140567 false false No definition available. No authoritative reference available. true 21 Net income attributable to Smith 3 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 24386000 24386 false false 2 true true 183273000 183273 false false 3 true true 121321000 121321 false false 4 true true 358264000 358264 false false No definition available. No authoritative reference available. true 22 Earnings per share attributable to Smith: 3 us-gaap_EarningsPerShareAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 23 Basic 4 us-gaap_EarningsPerShareBasic us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.11 0.11 false false 2 true true 0.91 0.91 false false 3 true true 0.55 0.55 false false 4 true true 1.78 1.78 false false No definition available. No authoritative reference available. false 24 Diluted 4 us-gaap_EarningsPerShareDiluted us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.11 0.11 false false 2 true true 0.91 0.91 false false 3 true true 0.55 0.55 false false 4 true true 1.77 1.77 false false No definition available. No authoritative reference available. false 25 Weighted average shares outstanding: 3 sii_WeightedAverageSharesOutstandingAbstract sii false na duration string Weighted average shares outstanding. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false Weighted average shares outstanding. false 26 Basic 4 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 219307000 219307 false false 2 false true 200938000 200938 false false 3 false true 219254000 219254 false false 4 false true 200873000 200873 false false No definition available. No authoritative reference available. false 27 Diluted 4 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 220245000 220245 false false 2 false true 202284000 202284 false false 3 false true 219925000 219925 false false 4 false true 202169000 202169 false false No definition available. No authoritative reference available. false false 4 23 false Thousands Thousands Hundreds false true