3.19.1 html 747 524 1 true 190 0 false 6 false false R1.htm 000 - Document - Document And Entity Information Sheet http://http/20181231/role/statement-document-and-entity-information Document And Entity Information Cover 1 false false R2.htm 001 - Statement - Consolidated Balance Sheets Sheet http://http/20181231/role/statement-consolidated-balance-sheets Consolidated Balance Sheets Statements 2 false false R3.htm 002 - Statement - Consolidated Balance Sheets (Parentheticals) Sheet http://http/20181231/role/statement-consolidated-balance-sheets-parentheticals Consolidated Balance Sheets (Parentheticals) Statements 3 false false R4.htm 003 - Statement - Consolidated Statements of Loss Sheet http://http/20181231/role/statement-consolidated-statements-of-loss Consolidated Statements of Loss Statements 4 false false R5.htm 004 - Statement - Consolidated Statements of Comprehensive Loss Sheet http://http/20181231/role/statement-consolidated-statements-of-comprehensive-loss Consolidated Statements of Comprehensive Loss Statements 5 false false R6.htm 005 - Statement - Consolidated Statements of Changes In Equity Sheet http://http/20181231/role/statement-consolidated-statements-of-changes-in-equity Consolidated Statements of Changes In Equity Statements 6 false false R7.htm 006 - Statement - Consolidated Statements of Cash Flows Sheet http://http/20181231/role/statement-consolidated-statements-of-cash-flows Consolidated Statements of Cash Flows Statements 7 false false R8.htm 007 - Disclosure - Note 1 - Nature of Operations and Accounting Policies Sheet http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies Note 1 - Nature of Operations and Accounting Policies Notes 8 false false R9.htm 008 - Disclosure - Note 2 - Business Acquisitions Sheet http://http/20181231/role/statement-note-2-business-acquisitions Note 2 - Business Acquisitions Notes 9 false false R10.htm 009 - Disclosure - Note 3 - Equipment Acquisitions and Dispositions Sheet http://http/20181231/role/statement-note-3-equipment-acquisitions-and-dispositions Note 3 - Equipment Acquisitions and Dispositions Notes 10 false false R11.htm 010 - Disclosure - Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies Sheet http://http/20181231/role/statement-note-4-investments-at-equity-and-advances-to-50-or-less-owned-companies Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies Notes 11 false false R12.htm 011 - Disclosure - Note 5 - Construction Reserve Funds Sheet http://http/20181231/role/statement-note-5-construction-reserve-funds Note 5 - Construction Reserve Funds Notes 12 false false R13.htm 012 - Disclosure - Note 6 - Leases Sheet http://http/20181231/role/statement-note-6-leases Note 6 - Leases Notes 13 false false R14.htm 013 - Disclosure - Note 7 - Long-term Debt Sheet http://http/20181231/role/statement-note-7-longterm-debt Note 7 - Long-term Debt Notes 14 false false R15.htm 014 - Disclosure - Note 8 - Income Taxes Sheet http://http/20181231/role/statement-note-8-income-taxes Note 8 - Income Taxes Notes 15 false false R16.htm 015 - Disclosure - Note 9 - Derivative Instruments and Hedging Strategies Sheet http://http/20181231/role/statement-note-9-derivative-instruments-and-hedging-strategies Note 9 - Derivative Instruments and Hedging Strategies Notes 16 false false R17.htm 016 - Disclosure - Note 10 - Fair Value Measurements Sheet http://http/20181231/role/statement-note-10-fair-value-measurements Note 10 - Fair Value Measurements Notes 17 false false R18.htm 017 - Disclosure - Note 11 - Warrants Sheet http://http/20181231/role/statement-note-11-warrants Note 11 - Warrants Notes 18 false false R19.htm 018 - Disclosure - Note 12 - Stockholders' Equity Sheet http://http/20181231/role/statement-note-12-stockholders-equity Note 12 - Stockholders' Equity Notes 19 false false R20.htm 019 - Disclosure - Note 13 - Noncontrolling Interests in Subsidiaries Sheet http://http/20181231/role/statement-note-13-noncontrolling-interests-in-subsidiaries Note 13 - Noncontrolling Interests in Subsidiaries Notes 20 false false R21.htm 020 - Disclosure - Note 14 - Savings and Multi-employer Pension Plans Sheet http://http/20181231/role/statement-note-14-savings-and-multiemployer-pension-plans Note 14 - Savings and Multi-employer Pension Plans Notes 21 false false R22.htm 021 - Disclosure - Note 15 - Share Based Compensation Sheet http://http/20181231/role/statement-note-15-share-based-compensation Note 15 - Share Based Compensation Notes 22 false false R23.htm 022 - Disclosure - Note 16 - Related Party Transactions Sheet http://http/20181231/role/statement-note-16-related-party-transactions Note 16 - Related Party Transactions Notes 23 false false R24.htm 023 - Disclosure - Note 17 - Commitments and Contingencies Sheet http://http/20181231/role/statement-note-17-commitments-and-contingencies Note 17 - Commitments and Contingencies Notes 24 false false R25.htm 024 - Disclosure - Note 18 - Major Customers and Segment Information Sheet http://http/20181231/role/statement-note-18-major-customers-and-segment-information Note 18 - Major Customers and Segment Information Notes 25 false false R26.htm 025 - Disclosure - Note 19 - Supplemental Information for Statements of Cash Flows Sheet http://http/20181231/role/statement-note-19-supplemental-information-for-statements-of-cash-flows Note 19 - Supplemental Information for Statements of Cash Flows Notes 26 false false R27.htm 026 - Disclosure - Note 20 - Subsequent Events Sheet http://http/20181231/role/statement-note-20-subsequent-events Note 20 - Subsequent Events Notes 27 false false R28.htm 027 - Disclosure - Note 21 - Quarterly Financial Information (Unaudited) Sheet http://http/20181231/role/statement-note-21-quarterly-financial-information-unaudited Note 21 - Quarterly Financial Information (Unaudited) Notes 28 false false R29.htm 028 - Disclosure - Schedule II - Valuation and Qualifying Accounts Sheet http://http/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts Schedule II - Valuation and Qualifying Accounts Notes 29 false false R30.htm 029 - Disclosure - Significant Accounting Policies (Policies) Sheet http://http/20181231/role/statement-significant-accounting-policies-policies Significant Accounting Policies (Policies) Policies http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies 30 false false R31.htm 030 - Disclosure - Note 1 - Nature of Operations and Accounting Policies (Tables) Sheet http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies-tables Note 1 - Nature of Operations and Accounting Policies (Tables) Tables http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies 31 false false R32.htm 031 - Disclosure - Note 2 - Business Acquisitions (Tables) Sheet http://http/20181231/role/statement-note-2-business-acquisitions-tables Note 2 - Business Acquisitions (Tables) Tables http://http/20181231/role/statement-note-2-business-acquisitions 32 false false R33.htm 032 - Disclosure - Note 3 - Equipment Acquisitions and Dispositions (Tables) Sheet http://http/20181231/role/statement-note-3-equipment-acquisitions-and-dispositions-tables Note 3 - Equipment Acquisitions and Dispositions (Tables) Tables http://http/20181231/role/statement-note-3-equipment-acquisitions-and-dispositions 33 false false R34.htm 033 - Disclosure - Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies (Tables) Sheet http://http/20181231/role/statement-note-4-investments-at-equity-and-advances-to-50-or-less-owned-companies-tables Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies (Tables) Tables http://http/20181231/role/statement-note-4-investments-at-equity-and-advances-to-50-or-less-owned-companies 34 false false R35.htm 034 - Disclosure - Note 5 - Construction Reserve Funds (Tables) Sheet http://http/20181231/role/statement-note-5-construction-reserve-funds-tables Note 5 - Construction Reserve Funds (Tables) Tables http://http/20181231/role/statement-note-5-construction-reserve-funds 35 false false R36.htm 035 - Disclosure - Note 6 - Leases (Tables) Sheet http://http/20181231/role/statement-note-6-leases-tables Note 6 - Leases (Tables) Tables http://http/20181231/role/statement-note-6-leases 36 false false R37.htm 036 - Disclosure - Note 7 - Long-term Debt (Tables) Sheet http://http/20181231/role/statement-note-7-longterm-debt-tables Note 7 - Long-term Debt (Tables) Tables http://http/20181231/role/statement-note-7-longterm-debt 37 false false R38.htm 037 - Disclosure - Note 8 - Income Taxes (Tables) Sheet http://http/20181231/role/statement-note-8-income-taxes-tables Note 8 - Income Taxes (Tables) Tables http://http/20181231/role/statement-note-8-income-taxes 38 false false R39.htm 038 - Disclosure - Note 9 - Derivative Instruments and Hedging Strategies (Tables) Sheet http://http/20181231/role/statement-note-9-derivative-instruments-and-hedging-strategies-tables Note 9 - Derivative Instruments and Hedging Strategies (Tables) Tables http://http/20181231/role/statement-note-9-derivative-instruments-and-hedging-strategies 39 false false R40.htm 039 - Disclosure - Note 10 - Fair Value Measurements (Tables) Sheet http://http/20181231/role/statement-note-10-fair-value-measurements-tables Note 10 - Fair Value Measurements (Tables) Tables http://http/20181231/role/statement-note-10-fair-value-measurements 40 false false R41.htm 040 - Disclosure - Note 13 - Noncontrolling Interests in Subsidiaries (Tables) Sheet http://http/20181231/role/statement-note-13-noncontrolling-interests-in-subsidiaries-tables Note 13 - Noncontrolling Interests in Subsidiaries (Tables) Tables http://http/20181231/role/statement-note-13-noncontrolling-interests-in-subsidiaries 41 false false R42.htm 041 - Disclosure - Note 15 - Share Based Compensation (Tables) Sheet http://http/20181231/role/statement-note-15-share-based-compensation-tables Note 15 - Share Based Compensation (Tables) Tables http://http/20181231/role/statement-note-15-share-based-compensation 42 false false R43.htm 042 - Disclosure - Note 16 - Related Party Transactions (Tables) Sheet http://http/20181231/role/statement-note-16-related-party-transactions-tables Note 16 - Related Party Transactions (Tables) Tables http://http/20181231/role/statement-note-16-related-party-transactions 43 false false R44.htm 043 - Disclosure - Note 17 - Commitments and Contingencies (Tables) Sheet http://http/20181231/role/statement-note-17-commitments-and-contingencies-tables Note 17 - Commitments and Contingencies (Tables) Tables http://http/20181231/role/statement-note-17-commitments-and-contingencies 44 false false R45.htm 044 - Disclosure - Note 18 - Major Customers and Segment Information (Tables) Sheet http://http/20181231/role/statement-note-18-major-customers-and-segment-information-tables Note 18 - Major Customers and Segment Information (Tables) Tables http://http/20181231/role/statement-note-18-major-customers-and-segment-information 45 false false R46.htm 045 - Disclosure - Note 19 - Supplemental Information for Statements of Cash Flows (Tables) Sheet http://http/20181231/role/statement-note-19-supplemental-information-for-statements-of-cash-flows-tables Note 19 - Supplemental Information for Statements of Cash Flows (Tables) Tables http://http/20181231/role/statement-note-19-supplemental-information-for-statements-of-cash-flows 46 false false R47.htm 046 - Disclosure - Note 21 - Quarterly Financial Information (Unaudited) (Tables) Sheet http://http/20181231/role/statement-note-21-quarterly-financial-information-unaudited-tables Note 21 - Quarterly Financial Information (Unaudited) (Tables) Tables http://http/20181231/role/statement-note-21-quarterly-financial-information-unaudited 47 false false R48.htm 047 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Tables) Sheet http://http/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-tables Schedule II - Valuation and Qualifying Accounts (Tables) Tables http://http/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts 48 false false R49.htm 048 - Disclosure - Note 1 - Nature of Operations and Accounting Policies (Details Textual) Sheet http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies-details-textual Note 1 - Nature of Operations and Accounting Policies (Details Textual) Details http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies-tables 49 false false R50.htm 049 - Disclosure - Note 1 - Nature of Operations and Accounting Policies - Deferred Revenues (Details) Sheet http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies-deferred-revenues-details Note 1 - Nature of Operations and Accounting Policies - Deferred Revenues (Details) Details 50 false false R51.htm 050 - Disclosure - Note 1 - Nature of Operations and Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) Sheet http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies-cash-cash-equivalents-and-restricted-cash-details Note 1 - Nature of Operations and Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) Details 51 false false R52.htm 051 - Disclosure - Note 1 - Nature of Operations and Accounting Policies - Property and Equipment Useful Life (Details) Sheet http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies-property-and-equipment-useful-life-details Note 1 - Nature of Operations and Accounting Policies - Property and Equipment Useful Life (Details) Details 52 false false R53.htm 052 - Disclosure - Note 1 - Nature of Operations and Accounting Policies - Summary of Property and Equipment (Details) Sheet http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies-summary-of-property-and-equipment-details Note 1 - Nature of Operations and Accounting Policies - Summary of Property and Equipment (Details) Details 53 false false R54.htm 053 - Disclosure - Note 1 - Nature of Operations and Accounting Policies - Deferred Gain Activity (Details) Sheet http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies-deferred-gain-activity-details Note 1 - Nature of Operations and Accounting Policies - Deferred Gain Activity (Details) Details 54 false false R55.htm 054 - Disclosure - Note 1 - Nature of Operations and Accounting Policies - Accumulated Other Comprehensive Income (Details) Sheet http://http/20181231/role/statement-note-1-nature-of-operations-and-accounting-policies-accumulated-other-comprehensive-income-details Note 1 - Nature of Operations and Accounting Policies - Accumulated Other Comprehensive Income (Details) Details 55 false false R56.htm 055 - Disclosure - Note 2 - Business Acquisitions (Details Textual) Sheet http://http/20181231/role/statement-note-2-business-acquisitions-details-textual Note 2 - Business Acquisitions (Details Textual) Details http://http/20181231/role/statement-note-2-business-acquisitions-tables 56 false false R57.htm 056 - Disclosure - Note 2 - Business Acquisitions - Allocation of the Purchase Price for the Company's Acquisitions (Details) Sheet http://http/20181231/role/statement-note-2-business-acquisitions-allocation-of-the-purchase-price-for-the-companys-acquisitions-details Note 2 - Business Acquisitions - Allocation of the Purchase Price for the Company's Acquisitions (Details) Details 57 false false R58.htm 057 - Disclosure - Note 3 - Equipment Acquisitions and Dispositions (Details Textual) Sheet http://http/20181231/role/statement-note-3-equipment-acquisitions-and-dispositions-details-textual Note 3 - Equipment Acquisitions and Dispositions (Details Textual) Details http://http/20181231/role/statement-note-3-equipment-acquisitions-and-dispositions-tables 58 false false R59.htm 058 - Disclosure - Note 3 - Equipment Acquisitions and Dispositions - Equipment Acquisitions and Dispositions (Details) Sheet http://http/20181231/role/statement-note-3-equipment-acquisitions-and-dispositions-equipment-acquisitions-and-dispositions-details Note 3 - Equipment Acquisitions and Dispositions - Equipment Acquisitions and Dispositions (Details) Details 59 false false R60.htm 059 - Disclosure - Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies (Details Textual) Sheet http://http/20181231/role/statement-note-4-investments-at-equity-and-advances-to-50-or-less-owned-companies-details-textual Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies (Details Textual) Details http://http/20181231/role/statement-note-4-investments-at-equity-and-advances-to-50-or-less-owned-companies-tables 60 false false R61.htm 060 - Disclosure - Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies - Equity Investments (Details) Sheet http://http/20181231/role/statement-note-4-investments-at-equity-and-advances-to-50-or-less-owned-companies-equity-investments-details Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies - Equity Investments (Details) Details 61 false false R62.htm 061 - Disclosure - Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies - Consolidation Net Assets (Details) Sheet http://http/20181231/role/statement-note-4-investments-at-equity-and-advances-to-50-or-less-owned-companies-consolidation-net-assets-details Note 4 - Investments, at Equity, and Advances to 50% or Less Owned Companies - Consolidation Net Assets (Details) Details 62 false false R63.htm 062 - Disclosure - Note 5 - Construction Reserve Funds - Construction Reserve Funds (Details) Sheet http://http/20181231/role/statement-note-5-construction-reserve-funds-construction-reserve-funds-details Note 5 - Construction Reserve Funds - Construction Reserve Funds (Details) Details 63 false false R64.htm 063 - Disclosure - Note 6 - Leases (Details Textual) Sheet http://http/20181231/role/statement-note-6-leases-details-textual Note 6 - Leases (Details Textual) Details http://http/20181231/role/statement-note-6-leases-tables 64 false false R65.htm 064 - Disclosure - Note 6 - Leases - Schedule of Future Minimum Rental Payments (Details) Sheet http://http/20181231/role/statement-note-6-leases-schedule-of-future-minimum-rental-payments-details Note 6 - Leases - Schedule of Future Minimum Rental Payments (Details) Details 65 false false R66.htm 065 - Disclosure - Note 7 - Long-term Debt (Details Textual) Sheet http://http/20181231/role/statement-note-7-longterm-debt-details-textual Note 7 - Long-term Debt (Details Textual) Details http://http/20181231/role/statement-note-7-longterm-debt-tables 66 false false R67.htm 066 - Disclosure - Note 7 - Long-term Debt - Schedule of long-term Debt Obligation (Details) Sheet http://http/20181231/role/statement-note-7-longterm-debt-schedule-of-longterm-debt-obligation-details Note 7 - Long-term Debt - Schedule of long-term Debt Obligation (Details) Details 67 false false R68.htm 067 - Disclosure - Note 7 - Long-term Debt - Schedule of Long-term Debt Maturities (Details) Sheet http://http/20181231/role/statement-note-7-longterm-debt-schedule-of-longterm-debt-maturities-details Note 7 - Long-term Debt - Schedule of Long-term Debt Maturities (Details) Details 68 false false R69.htm 068 - Disclosure - Note 8 - Income Taxes (Details Textual) Sheet http://http/20181231/role/statement-note-8-income-taxes-details-textual Note 8 - Income Taxes (Details Textual) Details http://http/20181231/role/statement-note-8-income-taxes-tables 69 false false R70.htm 069 - Disclosure - Note 8 - Income Taxes - Schedule of Income before Income Tax (Details) Sheet http://http/20181231/role/statement-note-8-income-taxes-schedule-of-income-before-income-tax-details Note 8 - Income Taxes - Schedule of Income before Income Tax (Details) Details 70 false false R71.htm 070 - Disclosure - Note 8 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) Sheet http://http/20181231/role/statement-note-8-income-taxes-components-of-income-tax-expense-benefit-details Note 8 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) Details 71 false false R72.htm 071 - Disclosure - Note 8 - Income Taxes - Income Tax Rate Reconciliation (Details) Sheet http://http/20181231/role/statement-note-8-income-taxes-income-tax-rate-reconciliation-details Note 8 - Income Taxes - Income Tax Rate Reconciliation (Details) Details 72 false false R73.htm 072 - Disclosure - Note 8 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) Sheet http://http/20181231/role/statement-note-8-income-taxes-schedule-of-deferred-tax-assets-and-liabilities-details Note 8 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) Details 73 false false R74.htm 073 - Disclosure - Note 9 - Derivative Instruments and Hedging Strategies (Details Textual) Sheet http://http/20181231/role/statement-note-9-derivative-instruments-and-hedging-strategies-details-textual Note 9 - Derivative Instruments and Hedging Strategies (Details Textual) Details http://http/20181231/role/statement-note-9-derivative-instruments-and-hedging-strategies-tables 74 false false R75.htm 074 - Disclosure - Note 9 - Derivative Instruments and Hedging Strategies - Derivative Instruments (Details) Sheet http://http/20181231/role/statement-note-9-derivative-instruments-and-hedging-strategies-derivative-instruments-details Note 9 - Derivative Instruments and Hedging Strategies - Derivative Instruments (Details) Details 75 false false R76.htm 075 - Disclosure - Note 9 - Derivative Instruments and Hedging Strategies - Effect of Derivative Instruments on Other Comprehensive Income (Loss) (Details) Sheet http://http/20181231/role/statement-note-9-derivative-instruments-and-hedging-strategies-effect-of-derivative-instruments-on-other-comprehensive-income-loss-details Note 9 - Derivative Instruments and Hedging Strategies - Effect of Derivative Instruments on Other Comprehensive Income (Loss) (Details) Details 76 false false R77.htm 076 - Disclosure - Note 9 - Derivative Instruments and Hedging Strategies - Gains (Losses) on Derivative Instruments (Details) Sheet http://http/20181231/role/statement-note-9-derivative-instruments-and-hedging-strategies-gains-losses-on-derivative-instruments-details Note 9 - Derivative Instruments and Hedging Strategies - Gains (Losses) on Derivative Instruments (Details) Details http://http/20181231/role/statement-note-9-derivative-instruments-and-hedging-strategies-tables 77 false false R78.htm 077 - Disclosure - Note 10 - Fair Value Measurements (Details Textual) Sheet http://http/20181231/role/statement-note-10-fair-value-measurements-details-textual Note 10 - Fair Value Measurements (Details Textual) Details http://http/20181231/role/statement-note-10-fair-value-measurements-tables 78 false false R79.htm 078 - Disclosure - Note 10 - Fair Value Measurements - Assets and Liabilities on Recurring Basis (Details) Sheet http://http/20181231/role/statement-note-10-fair-value-measurements-assets-and-liabilities-on-recurring-basis-details Note 10 - Fair Value Measurements - Assets and Liabilities on Recurring Basis (Details) Details 79 false false R80.htm 079 - Disclosure - Note 10 - Fair Value Measurements - Estimated Fair Value (Details) Sheet http://http/20181231/role/statement-note-10-fair-value-measurements-estimated-fair-value-details Note 10 - Fair Value Measurements - Estimated Fair Value (Details) Details 80 false false R81.htm 080 - Disclosure - Note 10 - Fair Value Measurements - Other Assets and Liabilities at Fair Value (Details) Sheet http://http/20181231/role/statement-note-10-fair-value-measurements-other-assets-and-liabilities-at-fair-value-details Note 10 - Fair Value Measurements - Other Assets and Liabilities at Fair Value (Details) Details 81 false false R82.htm 081 - Disclosure - Note 11 - Warrants (Details Textual) Sheet http://http/20181231/role/statement-note-11-warrants-details-textual Note 11 - Warrants (Details Textual) Details http://http/20181231/role/statement-note-11-warrants 82 false false R83.htm 082 - Disclosure - Note 12 - Stockholders' Equity (Details Textual) Sheet http://http/20181231/role/statement-note-12-stockholders-equity-details-textual Note 12 - Stockholders' Equity (Details Textual) Details http://http/20181231/role/statement-note-12-stockholders-equity 83 false false R84.htm 083 - Disclosure - Note 13 - Noncontrolling Interests in Subsidiaries (Details Textual) Sheet http://http/20181231/role/statement-note-13-noncontrolling-interests-in-subsidiaries-details-textual Note 13 - Noncontrolling Interests in Subsidiaries (Details Textual) Details http://http/20181231/role/statement-note-13-noncontrolling-interests-in-subsidiaries-tables 84 false false R85.htm 084 - Disclosure - Note 13 - Noncontrolling Interests in Subsidiaries - Noncontrolling Interest (Details) Sheet http://http/20181231/role/statement-note-13-noncontrolling-interests-in-subsidiaries-noncontrolling-interest-details Note 13 - Noncontrolling Interests in Subsidiaries - Noncontrolling Interest (Details) Details 85 false false R86.htm 085 - Disclosure - Note 14 - Savings and Multi-employer Pension Plans (Details Textual) Sheet http://http/20181231/role/statement-note-14-savings-and-multiemployer-pension-plans-details-textual Note 14 - Savings and Multi-employer Pension Plans (Details Textual) Details http://http/20181231/role/statement-note-14-savings-and-multiemployer-pension-plans 86 false false R87.htm 086 - Disclosure - Note 15 - Share Based Compensation (Details Textual) Sheet http://http/20181231/role/statement-note-15-share-based-compensation-details-textual Note 15 - Share Based Compensation (Details Textual) Details http://http/20181231/role/statement-note-15-share-based-compensation-tables 87 false false R88.htm 087 - Disclosure - Note 15 - Share Based Compensation - Equity Incentive Plan Transactions (Details) Sheet http://http/20181231/role/statement-note-15-share-based-compensation-equity-incentive-plan-transactions-details Note 15 - Share Based Compensation - Equity Incentive Plan Transactions (Details) Details 88 false false R89.htm 088 - Disclosure - Note 15 - Share Based Compensation - Restricted Stock Transactions (Details) Sheet http://http/20181231/role/statement-note-15-share-based-compensation-restricted-stock-transactions-details Note 15 - Share Based Compensation - Restricted Stock Transactions (Details) Details 89 false false R90.htm 089 - Disclosure - Note 15 - Share Based Compensation - Stock Option Transactions (Details) Sheet http://http/20181231/role/statement-note-15-share-based-compensation-stock-option-transactions-details Note 15 - Share Based Compensation - Stock Option Transactions (Details) Details 90 false false R91.htm 090 - Disclosure - Note 16 - Related Party Transactions (Details Textual) Sheet http://http/20181231/role/statement-note-16-related-party-transactions-details-textual Note 16 - Related Party Transactions (Details Textual) Details http://http/20181231/role/statement-note-16-related-party-transactions-tables 91 false false R92.htm 091 - Disclosure - Note 16 - Related Party Transactions - Related Party Transactions (Details) Sheet http://http/20181231/role/statement-note-16-related-party-transactions-related-party-transactions-details Note 16 - Related Party Transactions - Related Party Transactions (Details) Details 92 false false R93.htm 092 - Disclosure - Note 17 - Commitments and Contingencies (Details Textual) Sheet http://http/20181231/role/statement-note-17-commitments-and-contingencies-details-textual Note 17 - Commitments and Contingencies (Details Textual) Details http://http/20181231/role/statement-note-17-commitments-and-contingencies-tables 93 false false R94.htm 093 - Disclosure - Note 17 - Commitments and Contingencies - Expected Payment (Details) Sheet http://http/20181231/role/statement-note-17-commitments-and-contingencies-expected-payment-details Note 17 - Commitments and Contingencies - Expected Payment (Details) Details 94 false false R95.htm 094 - Disclosure - Note 18 - Major Customers and Segment Information (Details Textual) Sheet http://http/20181231/role/statement-note-18-major-customers-and-segment-information-details-textual Note 18 - Major Customers and Segment Information (Details Textual) Details http://http/20181231/role/statement-note-18-major-customers-and-segment-information-tables 95 false false R96.htm 095 - Disclosure - Note 18 - Major Customers and Segment Information - Summary of Reportable Segments (Details) Sheet http://http/20181231/role/statement-note-18-major-customers-and-segment-information-summary-of-reportable-segments-details Note 18 - Major Customers and Segment Information - Summary of Reportable Segments (Details) Details 96 false false R97.htm 096 - Disclosure - Note 18 - Major Customers and Segment Information - Income (Loss) in Equity Method Investments (Details) Sheet http://http/20181231/role/statement-note-18-major-customers-and-segment-information-income-loss-in-equity-method-investments-details Note 18 - Major Customers and Segment Information - Income (Loss) in Equity Method Investments (Details) Details http://http/20181231/role/statement-note-18-major-customers-and-segment-information-tables 97 false false R98.htm 097 - Disclosure - Note 19 - Supplemental Information for Statements of Cash Flows - Supplemental Information (Details) Sheet http://http/20181231/role/statement-note-19-supplemental-information-for-statements-of-cash-flows-supplemental-information-details Note 19 - Supplemental Information for Statements of Cash Flows - Supplemental Information (Details) Details 98 false false R99.htm 098 - Disclosure - Note 20 - Subsequent Events (Details Textual) Sheet http://http/20181231/role/statement-note-20-subsequent-events-details-textual Note 20 - Subsequent Events (Details Textual) Details http://http/20181231/role/statement-note-20-subsequent-events 99 false false R100.htm 099 - Disclosure - Note 21 - Quarterly Financial Information (Details) Sheet http://http/20181231/role/statement-note-21-quarterly-financial-information-details Note 21 - Quarterly Financial Information (Details) Details http://http/20181231/role/statement-note-21-quarterly-financial-information-unaudited-tables 100 false false R101.htm 100 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Details) Sheet http://http/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-details Schedule II - Valuation and Qualifying Accounts (Details) Details http://http/20181231/role/statement-schedule-ii-valuation-and-qualifying-accounts-tables 101 false false All Reports Book All Reports smhi-20181231.xml smhi-20181231.xsd smhi-20181231_cal.xml smhi-20181231_def.xml smhi-20181231_lab.xml smhi-20181231_pre.xml http://fasb.org/us-gaap/2018-01-31 http://xbrl.sec.gov/invest/2013-01-31 http://xbrl.sec.gov/country/2017-01-31 http://fasb.org/srt/2018-01-31 http://xbrl.sec.gov/dei/2018-01-31 true true