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Debt and Financing Arrangements (Interest Expense) - Summary of Recognized Interest Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Debt Instrument [Line Items] |  |  |  |
Total interest expense | $ 1,840 | $ 3,123 | $ 7,665 | $ 10,133
2010 Convertible Senior Subordinated Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total interest expense | 808 | 2,132 | 4,455 | 7,188
Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total interest expense | $ 1,032 | $ 991 | $ 3,210 | $ 2,945

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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