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Property and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Property Plant And Equipment [Abstract] | |||
| Interest capitalized in conjunction with construction projects | $ 1.9us-gaap_InterestCostsCapitalized | $ 2.5us-gaap_InterestCostsCapitalized | $ 1.2us-gaap_InterestCostsCapitalized |
| Commitments for facility construction projects | $ 32.9sah_CommitmentsForFacilityConstructionProjects | ||
| X | ||||||||||
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- Definition
Commitments for facility construction projects. No definition available.
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| X | ||||||||||
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- Definition
Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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