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Debt - Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Debt	$ 429,295	$ 357,407
Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt	250,000	0
Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt	102,368	99,890
Secured Debt [Member]
Line of Credit Facility [Line Items]
Debt	15,400	15,400
Other indebtedness [Member]
Line of Credit Facility [Line Items]
Debt	42,335	16,498
Senior secured credit facility [Member] \| Term loan facility [Member]
Line of Credit Facility [Line Items]
Debt	0	200,000
Six Percent Tangible Equity Units [Member]
Line of Credit Facility [Line Items]
Debt	$ 19,192	$ 25,619

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.

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