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Borrowing Arrangements - Summary of Recognized Interest Expense on 2010 Notes and 2006 Notes (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Debt Instrument [Line Items]        
Amortization of deferred financing costs     $ 2,258 $ 2,055
Convertible Senior Subordinated Notes [Member]
        
Debt Instrument [Line Items]        
Contractual coupon interest 1,590 1,591 3,181 3,181
Amortization of discount 710 659 1,394 1,295
Amortization of deferred financing costs 180 180 360 360
Total interest expense $ 2,480 $ 2,430 $ 4,935 $ 4,836