Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Insurance (Detail)

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Commitments and Contingencies - Insurance (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Commitment And Contingencies [Line Items]    
Insurance and other non-current liabilities $ 369,089 $ 342,356
Insurance Claims    
Commitment And Contingencies [Line Items]    
Gross amount accrued for insurance claims 243,200 254,700
Insurance and other non-current liabilities 185,000 200,000
Related insurance recoveries/receivables 36,900 50,400
Related insurance recoveries/receivables included in prepaid expenses and other current assets 400 400
Related insurance recoveries/receivables included in other assets net $ 36,500 $ 50,000