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Restructuring - Additional Information (Detail)
$ / qtr in Millions, $ in Millions
3 Months Ended 12 Months Ended
May 06, 2014
$ / qtr
Mar. 31, 2017
USD ($)
$ / qtr
Dec. 31, 2016
USD ($)
$ / qtr
Jun. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
2016 Restructuring [Member]              
Restructuring Cost and Reserve [Line Items]              
Reductions in company's worldwide workforce     30.00%        
Reduction of overall cost structure | $ / qtr     2.5        
Special charges for restructuring plan     $ 0.3        
2016 Restructuring [Member] | Scenario Forecast [Member]              
Restructuring Cost and Reserve [Line Items]              
Reductions in company's worldwide workforce   16.00%          
Special charges for restructuring plan   $ 0.3          
Non-cash stock based compensation expense   $ 0.1          
2016 Restructuring [Member] | Minimum [Member] | Scenario Forecast [Member]              
Restructuring Cost and Reserve [Line Items]              
Reduction of overall cost structure | $ / qtr   0.9          
2016 Restructuring [Member] | Maximum [Member] | Scenario Forecast [Member]              
Restructuring Cost and Reserve [Line Items]              
Reduction of overall cost structure | $ / qtr   1.0          
2014 Restructuring [Member]              
Restructuring Cost and Reserve [Line Items]              
Reductions in company's worldwide workforce 20.00%            
Reduction of overall cost structure | $ / qtr 2.0            
Special charges for restructuring plan       $ 1.8      
Non-cash stock based compensation expense       1.3      
Severance costs for affected employees       0.4      
Other restructuring related costs       $ 0.1      
2013 Restructuring [Member]              
Restructuring Cost and Reserve [Line Items]              
Reductions in company's worldwide workforce         26.00%    
Special charges for restructuring plan             $ 5.6
Severance costs for affected employees             1.1
Other restructuring related costs             0.2
Annualized savings         $ 16.0    
Lease/rental termination charges for restructuring           $ 0.8 3.3
Equipment and improvements write-offs due to lease/rental terminations           $ 0.6 $ 1.0