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Reorganization - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Restructuring Cost And Reserve [Line Items]        
Percentage of workforce reduction 2.00%     4.00%
Severance costs $ 1.0 $ 3.2 $ 3.2  
Severance costs, adjustment   (0.2)    
Subsidiary Liquidation [Member]        
Restructuring Cost And Reserve [Line Items]        
Reorganization costs   $ 0.3