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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Option | Dec. 31, 2012 | Dec. 31, 2011
Commitments And Contingencies Disclosure [Abstract] |  |  |
Lease exit expense | $ 2.9 |  |
Lease exit accrued cost | 0.3 |  |
Remaining lease exit expense | 2.6 |  |
Operating lease term for dealership facilities, minimum | 15 years |  |
Operating lease term for dealership facilities, maximum | 20 years |  |
Operating lease number of renewal options, minimum | 1 |  |
Operating lease number of renewal options, maximum | 2 |  |
Operating lease period of renewal options | 10 years |  |
Percentage of lease facility based on capitalization rates | 20.00% |  |
Lease expense for continuing operation | 99.6 | 102.4 | 103.2
Lease expense for discontinuing operation | 1.1 | 6.2 | 5.7
Leases, net contingent rent benefit related to decrease in interest rates from continuing operation | 2.3 | 2.3 | 2.3
Leases net contingent rent benefit related to decrease in interest rates from discontinuing operation | 0.6 | 0.6 | 0.6
Obligations under subleases, if subleases do not perform | 94.1 |  |
Estimated minimum lease payment | 7.2 |  |
Maximum exposure associated with general indemnifications | 14.0 |  |
General indemnifications minimum expiration period | 1 year |  |
General indemnifications maximum expiration period | 2 years |  |
Joint venture ownership percentage | 50.00% |  |
Contingent liability reserve balance after reduction | 2.8 |  |
Amount reserved for pending proceedings | $ 1.2 | $ 3.4 |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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