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Fair Value of Financial Instruments - Schedule of Assets Related to Discontinued Operations Measured at Fair Value on a Nonrecurring Basis (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | ||
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Mar. 31, 2014
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Jun. 30, 2014
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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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| Fair Value Of Assets And Liabilities Measured On Recurring And Non Recurring Basis [Line Items] | |||||
| Impairment of intangible assets | $ 500,000 | $ 700,000 | $ 700,000 | $ 0 | $ 664,000 |