Debt (New Term Loan) (Detail) - New Term Loan
3 Months Ended
Mar. 21, 2017
Mar. 31, 2017
Apr. 03, 2017
Line Of Credit Facility [Line Items]      
Debt instrument maturity date Mar. 21, 2021 Mar. 21, 2021  
Alternate Base Rate      
Line Of Credit Facility [Line Items]      
Basis spread on variable rate 6.75% 6.75%  
Outstanding borrowings, accruing interest rate   10.75%  
Adjusted LIBO Rate      
Line Of Credit Facility [Line Items]      
Basis spread on variable rate 7.75% 7.75%  
Debt instrument floor rate 1.00% 1.00%  
Adjusted LIBO Rate | Subsequent Event      
Line Of Credit Facility [Line Items]      
Outstanding borrowings, accruing interest rate     8.78%