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Intangible Assets and Goodwill - Changes in Carrying Amount of Franchise Assets and Goodwill (Detail) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 02, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Franchise Assets, Reductions from impairment |  | $ (2,200,000)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |  |
Net Goodwill, Beginning balance |  | 476,315,000 us-gaap_Goodwill | 454,224,000 us-gaap_Goodwill |
Net Goodwill, Additions through current year acquisitions |  | 10,176,000 us-gaap_GoodwillAcquiredDuringPeriod | 22,091,000 us-gaap_GoodwillAcquiredDuringPeriod |
Net Goodwill, Prior year acquisition allocations |  | (3,000)us-gaap_GoodwillPurchaseAccountingAdjustments |  |
Net Goodwill, Reductions from dispositions |  | (10,559,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit |  |
Net Goodwill, Reductions from impairment | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss
Net Goodwill, Ending balance |  | 475,929,000 us-gaap_Goodwill | 476,315,000 us-gaap_Goodwill | 454,224,000 us-gaap_Goodwill
Franchise Assets [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Franchise Assets, Beginning balance |  | 79,535,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember | 60,635,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |
Franchise Assets, Additions through current year acquisitions |  | 7,500,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember | 19,500,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |
Franchise Assets, Reductions from dispositions |  | (7,735,000)us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |  |
Franchise Assets, Reductions from impairment |  | (2,200,000)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember | (600,000)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |
Franchise Assets, Ending balance |  | $ 77,100,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember | $ 79,535,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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