Quarterly report pursuant to Section 13 or 15(d)

Long Term Debt Activity - Additional Information (Detail)

v3.8.0.1
Long Term Debt Activity - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 16, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]            
Loss on debt amendments and refinancing   $ 0 $ 0 $ 246 $ 13,284  
Carrying value of long-term debt   1,820,112   1,820,112   $ 1,822,966
Fair value of long-term debt   1,840,641   1,840,641   $ 1,850,212
Senior Secured Credit Facility Agreement | Debt Amendments            
Debt Instrument [Line Items]            
Debt instrument, reduction in interest rate 0.25%          
Debt issuance costs   $ 521   521    
Loss on debt amendments and refinancing       $ 246