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Responsibilities and Commitments - Summary of Other Operating Leases with Payment Scheduled (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
Disclosure of finance lease and operating lease by lessee [line items]  
Operating lease payments $ 32,100,000
2019 [member]  
Disclosure of finance lease and operating lease by lessee [line items]  
Operating lease payments 5,400,000
2020 [member]  
Disclosure of finance lease and operating lease by lessee [line items]  
Operating lease payments 4,500,000
2021 [member]  
Disclosure of finance lease and operating lease by lessee [line items]  
Operating lease payments 4,000,000
2022 [member]  
Disclosure of finance lease and operating lease by lessee [line items]  
Operating lease payments 3,500,000
Thereafter 2022 [member]  
Disclosure of finance lease and operating lease by lessee [line items]  
Operating lease payments $ 14,700,000