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Financing Arrangements (Convertible Senior Notes) - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 31, 2012
USD ($)
shares
Mar. 31, 2016
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2012
USD ($)
Debt Disclosure [Abstract]            
Convertible senior notes   $ 0       $ 112,500,000
Convertible senior notes interest rate           3.75%
Convertible senior notes convertible latest date   Aug. 15, 2019        
Debt conversion, maximum number of common stock shares | shares 15,000,000          
Conversion price per share | $ / shares   $ 7.50        
Convertible senior notes, transactional fees $ 3,537,000 $ 0        
Amount of shares issued upon conversion | shares       15,000,000    
Amount of discount on convertible notes         $ 108,955,000  
Convertible senior notes, unamortized discount       $ 3,395,000 $ 3,395,000  
Convertible senior notes, total interest and amortization expense recognized     $ 1,258,000      
Initial conversion rate, number of common stock issuable   0.1333