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Debt and Financing Arrangements - Summary of Recognized Interest Expense on 2010 Notes and 2006 Notes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Total interest expense | $ 8,902 | $ 13,124 | $ 15,374
2010 Convertible Senior Subordinated Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total interest expense | 4,559 | 9,068 | 9,898
Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total interest expense | 4,320 | 4,033 | 5,453
2006 Convertible Senior Subordinated Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total interest expense | $ 23 | $ 23 | $ 23

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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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