Annual report pursuant to Section 13 and 15(d)

Share-Based Awards and Cash-Based Awards - Additional Information (Details)

v3.6.0.2
Share-Based Awards and Cash-Based Awards - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share based compensation performance awards grant performance period   10 years    
Annual incentive awards payment period   90 days    
Additional shares authorized under share based compensation arrangements   3,300,000    
Common stock available for award under plans   6,933,337    
Cash based compensation payment period after achievement of financial condition   30 days    
Cash based compensation payment period       75 days
2014 Annual Incentive Plan Award | Chief Executive Officer        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock pre-determined price per share       $ 14.66
Performance based awards, percentage       100.00%
Directors Compensation Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock available for award under plans   317,896    
Restricted Stock Units (RSUs)        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares granted, grant date fair value   $ 9,300,000 $ 9,400,000 $ 20,100,000
Shares vested, vested date fair value   2,400,000 2,100,000 2,000,000
Unrecognized share-based compensation expense   $ 9,700,000    
Recognition period for unrecognized compensation expense   2018-11    
CEO's 2014 Award | Chief Executive Officer        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares issued 37,316      
Restricted Shares        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares granted, grant date fair value   $ 300,000 300,000 300,000
Shares vested, vested date fair value   100,000 $ 100,000 $ 300,000
Unrecognized share-based compensation expense   $ 400,000    
Recognition period for unrecognized compensation expense   2019-04    
Restricted Shares | Directors Compensation Plan Share-Based Awards        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting rights description   Vesting occurs upon completion of the specified vesting period and one-third of each grant vests each year over a three-year period.    
Grant vesting period   3 years 3 years 3 years
Cash-based Awards | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Adjusted EBITDA less interest expense   $ 300,000,000    
Adjusted EBITDA and Adjusted EBITDA Margin        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Restricted stock units earning per share, minimum   0.00% 0.00% 0.00%
Restricted stock units earning per share, maximum   100.00% 100.00% 100.00%