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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