Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Status of Supplemental Executive Retirement Plan (Parenthetical) (Detail)

v3.8.0.1
Employee Benefit Plans - Status of Supplemental Executive Retirement Plan (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Other long-term liabilities $ 61,918 $ 61,170
Other accrued liabilities 237,963 $ 236,982
Supplemental Employee Retirement Plans, Defined Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other long-term liabilities 13,300  
Other accrued liabilities $ 300