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Debt - Schedule of Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Debt | $ 110,358 | $ 381,515
6% Tangible Equity Units |  |
Line of Credit Facility [Line Items] |  |
Debt | 0 | 8,666
Senior Notes |  |
Line of Credit Facility [Line Items] |  |
Debt | 5,200 | 224,647
Convertible Debt |  |
Line of Credit Facility [Line Items] |  |
Debt | 104,673 | 104,719
Secured Promissory Notes |  |
Line of Credit Facility [Line Items] |  |
Debt | 0 | 15,400
Other Indebtedness |  |
Line of Credit Facility [Line Items] |  |
Debt | $ 485 | $ 28,083

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