• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2017
Dec. 31, 2016
Feb. 27, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value transfers between Level 1, 2 or 3   $ 0 $ 0  
3.95% Promissory Note [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt instrument stated interest rate   3.95%   3.95%
3.95% Promissory Note [Member] | Revolving Credit Facility [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt instrument stated interest rate 3.95%      
Debt instrument, maturity term 3 years