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Debt and Financing Arrangements (2010 Notes) - Additional Information (Detail) - USD ($)
shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2015
Oct. 30, 2015
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]                            
Non operating charge included in other income, net     $ 2,706,000 $ (1,673,000) $ (1,126,000) $ 2,859,000 $ 2,350,000 $ (1,368,000) $ 3,936,000 $ 1,975,000   $ 2,766,000 $ 6,893,000 $ 7,817,000
Other Income [Member]                            
Debt Instrument [Line Items]                            
Non operating charge included in other income, net                       800,000 1,500,000  
2010 Convertible Senior Subordinated Notes [Member]                            
Debt Instrument [Line Items]                            
Principal amount of notes $ 48,400,000   $ 48,400,000       $ 97,650,000         $ 48,400,000 $ 97,650,000  
Conversion rate per $ 1,000 principal of convertible notes $ 1,000                          
Conversion value of Notes   $ 71,800,000                        
Maturity date of notes                       Oct. 01, 2015    
Shares issued in exchange for partial retirement of debt         5.1           1.5 5.1 1.5  
Partial extinguishment of debt         $ 49,300,000           $ 32,400,000 $ 49,300,000 $ 32,400,000  
Common stock equivalent impact                       1.2 2.0