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Goodwill and Intangible Assets - Additional Information (Detail)
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12 Months Ended | 1 Months Ended | |||
|---|---|---|---|---|---|
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Dec. 31, 2014
USD ($)
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Dec. 31, 2013
USD ($)
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Dec. 31, 2012
USD ($)
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Mar. 31, 2014
JSR Corporation [Member]
USD ($)
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Mar. 31, 2014
JSR Corporation [Member]
EUR (€)
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| Finite-Lived Intangible Assets [Line Items] | |||||
| Impairment of goodwill | $ 0 | $ 0 | $ 0 | ||
| Date for performing annual impairment test | October 1st | ||||
| Purchase price of acquisition | 26,100,000 | 19,000,000 | |||
| Percentage of capacity rights in subsidiary | 50.00% | 50.00% | |||
| Effective date of acquisition | Mar. 31, 2014 | Mar. 31, 2014 | |||
| Estimated useful life | 6 years | 6 years | |||
| Amortization expense related to finite-lived intangible assets | $ 19,600,000 | $ 15,700,000 | $ 14,700,000 | ||