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Borrowing Arrangements - Summary of Carrying Amount of Debt and Equity Components (Detail) (2010 Convertible Senior Subordinated Notes [Member], USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
2010 Convertible Senior Subordinated Notes [Member]
   
Debt Instrument [Line Items]    
Principal amount of notes $ 130,000,000 $ 130,000,000
Unamortized discount (3,994,000) (5,494,000)
Net carrying amount 126,006,000 124,506,000
Additional paid-in-capital, net of tax $ 8,555,000 $ 8,555,000