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Debt and Financing Arrangements - Summary of Recognized Interest Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]        
Total interest expense $ 1,760 $ 1,840 $ 5,019 $ 7,665
Credit Facility [Member]        
Debt Instrument [Line Items]        
Total interest expense $ 1,760 872 5,011 3,088
2010 Convertible Senior Subordinated Notes [Member]        
Debt Instrument [Line Items]        
Total interest expense   962   4,559
2006 Convertible Senior Subordinated Notes [Member]        
Debt Instrument [Line Items]        
Total interest expense   $ 6 $ 8 $ 18