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Accounting Policies (Narratives) (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Cash, Insured and Uninsured [Abstract] |  |  |  |  |  |
Cash, FDIC Insured Amount |  |  |  | $ 250,000 | $ 250,000 |
Cash, CDIC insured amount |  |  |  | $ 100,000 | $ 100,000 |
LIFO Method Related Items [Abstract] |  |  |  |  |  |
Percentage of LIFO inventory |  |  |  | 94.00% | 97.00% |
Inventory, LIFO reserve |  |  |  | $ 14,340,000 | $ 13,463,000 |
Effect of LIFO inventory liquidation on income |  |  |  | 100,000 |  |
Disposition of Property, Plant and Equipment |  |  |  |  |  |
Net amount of (gains) losses netted against depreciation expense |  |  |  | (36,100,000) | (98,700,000) | $ (74,600,000)
Additional operating expenses |  |  |  | $ 23,900,000 |  |
Schedule of rental trucks depreciation: |  |  |  |  |  |
Percentage reduction for year one, depreciation |  |  |  | 16.00% |  |
Percentage reduction for year two, depreciation |  |  |  | 13.00% |  |
Percentage reduction for year three, depreciation |  |  |  | 11.00% |  |
Percentage reduction for year four, depreciation |  |  |  | 9.00% |  |
Percentage reduction for year five, depreciation |  |  |  | 8.00% |  |
Percentage reduction for year six, depreciation |  |  |  | 7.00% |  |
Percentage reduction for year seven, depreciation |  |  |  | 6.00% |  |
Salvage value percentage under the old declining balance method |  |  |  | 20.00% |  |
Month and year depreciation method changed |  |  |  | 2012-10 |  |
Salvage value percentage |  |  |  | 15.00% |  |
Percentage reduction if straight line approach used each year for depreciation calculation |  |  |  | 5.70% |  |
Real Estate Companies Disclosures [Abstract] |  |  |  |  |  |
Carrying value of surplus real estate |  |  |  | $ 66,200,000 | 34,400,000 |
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |  |  |  |
Self insurance reserve |  |  |  | 399,200,000 | 386,400,000 |
Accrued insurance, noncurrent |  |  |  | 13,700,000 | 9,500,000 |
Estimated insurance recoveries |  |  |  | 100,000 | 200,000 |
Marketing and Advertising Expense [Abstract] |  |  |  |  |  |
Advertising expense |  |  |  | $ 8,700,000 | $ 9,600,000 | $ 7,500,000
Policyholder Benefits and Claims Incurred [Abstract] |  |  |  |  |  |
Deferred sales inducements, net | $ 23,000,000 | $ 24,600,000 |  |  |  |
Deferred sales inducements, amortization expense | $ 3,300,000 | $ 3,000,000 | $ 2,400,000 |  |  |
Engine and Transmission Overhaul [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  | 2 years |  |
Engine and Transmission Overhaul [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  | 20 years |  |
All Nonrental Equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  | 3 years |  |
All Nonrental Equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  | 55 years |  |

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- Definition The insured amount by Canadian financial institutions. It is insured by the Canada Deposit Insurance Corporation ("CDIC"). This is the maximum amount issued by this institution. + References No definition available. + Details
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- Definition The percentage reduction in year five of the book value of a rental truck. + References No definition available. + Details
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