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Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Interest expense $ 18,000,000 $ 18,000,000 $ 36,000,000 $ 31,000,000  
Gain on termination of cash flow hedge   3,000,000   3,000,000  
Fair Value Measurement on Nonrecurring Basis [Member]          
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Assets fair value 0 0 0 0  
Liabilities fair value 0 $ 0 0 $ 0  
Level 2 | Maximum [Member]          
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Assets fair value 100,000   100,000   $ 200,000
Interest expense $ 100,000   $ 200,000