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Commitments and Contingencies - Additional Information (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Other Commitments [Line Items]  
Severance payment under agreement description Certain of the agreements also provide for a severance payment of one to three times annual salary and one half to three times average annual bonus if such an agreement is terminated without good cause by the employer or for good reason by the employee.
Employees under contract terminated by employer without good cause or change in control $ 41.2
Employees under contract terminated by employer without good cause or in absence of change in control $ 19.2
Minimum  
Other Commitments [Line Items]  
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements 6 months
Severance payment as a percentage of annual salary 100.00%
Severance payment as a percentage of annual bonus 50.00%
Maximum  
Other Commitments [Line Items]  
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements 3 years
Severance payment as a percentage of annual salary 300.00%
Severance payment as a percentage of annual bonus 300.00%