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Restructuring - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2012
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Restructuring Reserve [Abstract]        
Percentage reduction of headcount 7.00% 26.00%    
Annualized savings $ 7,000,000 $ 16,000,000    
Special charges of restructuring plan     5,600,000  
Lease/rental termination charges for restructuring     3,300,000  
Severance costs for affected employees     1,100,000  
Equipment and improvements write-offs due to lease/rental terminations     1,000,000  
Other restructuring related costs     200,000  
Cash expenditures paid out     1,400,000  
Restructuring liability included in accrued liabilities     1,978,000 8,000
Restructuring liability is included in deferred rent and other long term liabilities     1,394,000  
One-time employee termination and other costs       $ 200,000