| Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | ||
|---|---|---|---|
| Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | |
| Schedule Of Estimated Future Amortization Expense [Line Items] | |||
| Amortization expense for intangibles | $ 4.9 | $ 2.3 | $ 0.5 | 
| Identifiable asset with an indefinite life | 0.5 | ||
| Impairment charge of indefinite-lived intangible | 0 | 0 | |
| Trade Names [Member] | |||
| Schedule Of Estimated Future Amortization Expense [Line Items] | |||
| Impairment charge of indefinite-lived intangible | $ 0.1 | ||
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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