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Quarterly Financial Summary (Unaudited) - Schedule of Quarterly Financial Summary (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
 [1]
Sep. 30, 2018
Jun. 30, 2018
 [2]
Mar. 31, 2018
 [3]
Dec. 31, 2017
 [4]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 145,505 $ 145,690 $ 142,036 $ 148,065 $ 143,118 $ 144,986 $ 146,222 $ 162,109 $ 581,296 $ 596,435  
Operating income (loss) 20,183 19,283 11,303 20,529 10,712 4,539 9,104 9,781 71,298 [5] 34,136 [5] $ (32,344) [5]
Net income (loss) $ 14,071 $ 14,857 $ 8,751 $ 17,502 $ (44,382) $ 3,022 $ 4,286 $ 5,177 $ 55,181 $ (31,897) $ (18,712)
Net income (loss) per share Basic $ 0.20 [6] $ 0.21 [6] $ 0.13 [6] $ 0.25 [6] $ (0.64) [6] $ 0.04 [6] $ 0.06 [6] $ 0.08 [6] $ 0.79 [6] $ (0.46) [6] $ (0.27)
Net income (loss) per share Diluted $ 0.20 [6] $ 0.21 [6] $ 0.12 [6] $ 0.25 [6] $ (0.64) [6] $ 0.04 [6] $ 0.06 [6] $ 0.07 [6] $ 0.77 [6] $ (0.46) [6] $ (0.27)
[1] Fourth quarter of 2018 net income included a $5.0 million significant legal settlement.
[2] Second quarter of 2018 net income included a $6.0 million significant legal settlement.
[3] First quarter of 2018 net income included a $3.5 million significant legal settlement.
[4] Fourth quarter of 2017 net loss included a $6.5 million significant legal settlement. Fourth quarter 2017 also includes $52.7 million of tax expense related to the impact of the Tax Cuts and Jobs Act which was enacted in the fourth quarter of 2017.
[5] The statement of income (loss) and comprehensive income (loss) balances including revenue, operating income (loss), depreciation and amortization and capital expenditures are presented above on a continuing operations basis. Total assets are presented on a consolidated basis including continuing and discontinued operations.
[6] Basic and diluted earnings per share are calculated independently for each of the quarters presented. Accordingly, the sum of the quarterly earnings per share amounts may not agree with the annual earnings per share amount for the corresponding year.