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Earnings (Loss) Per Share - Computations of Class A Basic and Diluted Earnings (Loss) per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Antidilutive securities excluded from computation of earnings per share 8,100,000 8,000,000 8,500,000 8,100,000
Earnings Per Share, Basic, Two Class Method [Abstract]        
Net Income (Loss) Attributable to Parent $ 14,220 $ (3,223) $ 19,873 $ (26,893)
Less: earnings allocated to participating securities (26) (13) (48) (22)
Undistributed Earnings (Loss) Attributable to Common Stockholders $ 14,194 $ (3,236)    
Net Income (Loss) Available to Common Stockholders, Basic     $ 19,825 $ (26,915)
Denominator for earnings (loss) per share:        
Class A common stock - basic 87,065,591 74,443,901 87,064,110 74,440,950
Class A common stock - diluted 87,217,381 74,443,901 87,257,130 74,440,950
Calculation of basic and diluted earnings (loss) per share:        
Basic and diluted $ 0.16 $ (0.04) $ 0.23 $ (0.36)
Dividends declared per Class A common share $ 0.42 $ 0.39 $ 0.83 $ 0.77
Employee Stock Option [Member]        
Denominator for earnings (loss) per share:        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 7,488 0 0 0
Restricted Stock [Member]        
Denominator for earnings (loss) per share:        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 144,302 0 185,366 0
Restricted Stock Units (RSUs) [Member]        
Denominator for earnings (loss) per share:        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0 0 7,654 0