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Carrying Amounts and Estimated Fair Values of Debt Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Long term debt-December 2012 financing, Carrying Value $ 89,152   $ 87,717
Long term debt-December 2012 financing, Estimated Fair Value 79,400   75,700
Convertible Debt | 2012 Notes
     
Debt Instrument [Line Items]      
Exchangeable Senior Notes, carrying Value 31,266   149,317
Exchangeable Senior Notes, Estimated Fair Value 24,100 126,200 106,600
Convertible Debt | 2014 Notes
     
Debt Instrument [Line Items]      
Exchangeable Senior Notes, carrying Value 89,221    
Exchangeable Senior Notes, Estimated Fair Value $ 78,700