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Debt and Financing Arrangements - Summary of Recognized Interest Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Debt Instrument [Line Items]        
Total interest expense $ 1,733 $ 2,848 $ 3,259 $ 5,825
Credit Facility [Member]        
Debt Instrument [Line Items]        
Total interest expense 1,731 1,165 3,251 2,216
2010 Convertible Senior Subordinated Notes [Member]        
Debt Instrument [Line Items]        
Total interest expense   1,677   3,597
2006 Convertible Senior Subordinated Notes [Member]        
Debt Instrument [Line Items]        
Total interest expense $ 2 $ 6 $ 8 $ 12