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Debt - Debt (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Debt | $ 434,840 | $ 432,744
Senior Notes [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt | 250,000 | 250,000
Convertible Debt [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt | 104,846 | 103,194
Secured Debt [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt | 15,400 | 15,400
Other indebtedness [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt | 51,586 | 46,996
Six Percent Tangible Equity Units [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt | $ 13,008 | $ 17,154

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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