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Borrowing Arrangements - Summary of Recognized Interest Expense on 2010 Notes and 2006 Notes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Amortization of deferred financing costs $ 4,568 $ 4,227 $ 4,820
Convertible Senior Subordinated Notes [Member]
      
Debt Instrument [Line Items]      
Contractual coupon interest 6,361 6,361  
Amortization of discount 2,840 2,638  
Amortization of deferred financing costs 720 720  
Total interest expense $ 9,921 $ 9,719