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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Revenue From Contract With Customer [Abstract]    
Contract assets $ 465,700 $ 381,800
Contract assets, current 323,247 307,020
Contract liabilities 120,000 92,500
Contract liabilities, current 109,511 $ 82,227
Recognized revenue included in contract liability $ 64,300