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Retirement Plans (Details 2) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 13 Months Ended
Aug. 31, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Employees' savings plan            
Matching contribution by the company (as a percent)           100.00%
Matching contribution by the company prior to September 1, 2012 (as a percent) 50.00%          
Expenses recognized under 401(K) plan   $ 871,000 $ 418,000 $ 2,100,000 $ 1,100,000  
Minimum
           
Employees' savings plan            
Age of employees to be eligible to participate in the defined contribution plan       21 years    
Percentage of annual base compensation that participants may elect to contribute       1.00%    
Maximum
           
Employees' savings plan            
Percentage of annual base compensation that participants may elect to contribute       50.00%    
Percentage of employees salary for which the company contributes a matching contribution           5.00%
Percentage of employees salary for which the company contributes a matching contribution, prior to September 1, 2012 6.00%