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Quarterly Financial Information (unaudited) - Summary of Selected Financial Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 217,851 | $ 214,146 | $ 209,123 | $ 199,542 | $ 193,281 | $ 194,497 | $ 188,972 | $ 179,293 | $ 840,662 | $ 756,043 | $ 591,022
Gross profit | 105,500 | 103,429 | 95,863 | 94,348 | 92,817 | 93,480 | 86,936 | 82,118 | 399,140 | 355,351 | 277,187
Income before income taxes | 45,173 | 43,522 | 36,974 | 35,959 | 35,119 | 36,419 | 30,195 | 27,574 |  |  |
Net income | $ 61,798 | $ 38,263 | $ 31,578 | $ 32,306 | $ 31,196 | $ 35,430 | $ 25,007 | $ 18,224 | $ 163,945 | $ 109,857 | $ 64,869
Diluted (USD per share) | $ 1.56 | $ 0.97 | $ 0.81 | $ 0.83 | $ 0.80 | $ 0.91 | $ 0.65 | $ 0.47 | $ 4.18 | $ 2.82 | $ 1.77
Shares used in computing diluted earnings per share | 39,499 | 39,342 | 39,201 | 38,932 | 38,975 | 39,062 | 38,738 | 39,071 | 39,246 | 38,961 | 36,552
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax benefit |  |  |  |  |  |  |  |  | $ 21,625 | $ 0 | $ 0

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