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Segment Information - Income from Segments to Consolidated Net Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting [Abstract]        
Total EBITDA $ 49,517 $ 25,761 $ 146,429 $ 120,825
Less        
Income tax expense 3,302 (4,840) 10,349 1,248
Interest expense, net 7,352 7,853 22,375 21,894
Depreciation and amortization 15,788 16,606 47,383 48,189
Net income $ 23,075 $ 6,142 $ 66,322 $ 49,494