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Income Taxes - Provision (Benefit) for Current and Deferred Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
Federal $ (3,153) $ (3,041) $ (1,405)
State 1,885 2,455 1,946
Foreign 113,315 91,070 89,825
Total current income tax expense 112,047 90,484 90,366
Deferred      
Federal 418,341 (4,624) (3,802)
State 38,450 2,623 (2,200)
Foreign (19,989) 3,237 10,135
Total deferred income tax expense 436,802 1,236 4,133
Provision for income taxes $ 548,849 $ 91,720 $ 94,499