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Summary of Significant Accounting Policies - Computation of Basic and Diluted EPS (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                      
Net income $ 165,339 $ 64,227 $ 51,151 $ 48,147 $ 57,023 $ 38,747 $ 28,221 $ 7,005 $ 328,864 $ 130,996 $ 42,862
Shares:                      
Weighted average common shares outstanding - used in calculation of basic EPS                 204,923 200,252 182,196
Weighted average common stock equivalents — options and restricted shares                 6,709 5,541 8,700
Weighted average common and common equivalent shares outstanding - used in calculation of diluted EPS                 211,632 205,793 190,896
Earnings per share - Basic $ 0.80 $ 0.31 $ 0.25 $ 0.24 $ 0.28 $ 0.19 $ 0.14 $ 0.04 $ 1.60 $ 0.65 $ 0.24
Earnings per share - Diluted $ 0.77 $ 0.30 $ 0.24 $ 0.23 $ 0.28 $ 0.19 $ 0.14 $ 0.03 $ 1.55 $ 0.64 $ 0.22