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Quarterly Results of Operations (Unaudited) - Summarizes the Unaudited Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net revenue | $ 177,548 | $ 155,454 | $ 236,818 | $ 275,681 | $ 271,418 | $ 236,209 | $ 218,301 | $ 248,206 | $ 512,499 | $ 845,501 | $ 974,134 | $ 873,344
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Technology and academic services | 11,098 | 11,101 | 10,678 | 10,697 | 10,739 | 10,494 | 10,220 | 10,381 |  | 43,574 | 41,834 | 39,101
Counseling services and support | 51,989 | 51,116 | 50,838 | 50,747 | 50,213 | 46,100 | 45,970 | 46,312 |  | 204,690 | 188,595 | 175,045
Marketing and communication | 27,252 | 31,546 | 30,095 | 28,527 | 26,227 | 28,130 | 27,426 | 27,309 |  | 117,420 | 109,092 | 98,592
General and administrative | 6,695 | 10,092 | 5,762 | 7,419 | 5,975 | 8,343 | 5,806 | 7,033 |  | 29,968 | 27,157 | 28,079
University related expenses | (405) | 6,569 | 79,517 | 87,649 | 86,356 | 83,450 | 73,791 | 80,543 |  | 173,330 | 324,140 | 294,188
Loss on Transaction | 770 | 15,610 | 1,440 | 550 | 562 |  |  |  |  | 18,370 | 562 | 1,136
Total costs and expenses | 97,399 | 126,034 | 178,330 | 185,589 | 180,072 | 176,517 | 163,213 | 171,578 |  | 587,352 | 691,380 | 636,141
Operating income | 80,149 | 29,420 | 58,488 | 90,092 | 91,346 | 59,692 | 55,088 | 76,628 |  | 258,149 | 282,754 | 237,203
Interest income on Secured Note | 13,699 | 13,248 |  |  |  |  |  |  |  | 26,947 |  |
Interest expense | (575) | (558) | (57) | (346) | (527) | (567) | (495) | (580) |  | (1,536) | (2,169) | (1,328)
Investment interest and other | 521 | 371 | 1,567 | 981 | 757 | 1,445 | 739 | 2 |  | 3,440 | 2,943 | 249
Income before income taxes | 93,794 | 42,481 | 59,998 | 90,727 | 91,576 | 60,570 | 55,332 | 76,050 |  | 287,000 | 283,528 | 236,124
Income tax expense | 18,263 | 8,720 | 13,960 | 17,046 | 23,320 | 21,266 | 15,485 | 20,138 |  | 57,989 | 80,209 | 87,610
Net income | $ 75,531 | $ 33,761 | $ 46,038 | $ 73,681 | $ 68,256 | $ 39,304 | $ 39,847 | $ 55,912 |  | $ 229,011 | $ 203,319 | $ 148,514
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic income per share | $ 1.58 | $ 0.71 | $ 0.97 | $ 1.55 | $ 1.44 | $ 0.83 | $ 0.85 | $ 1.20 |  | $ 4.81 | $ 4.31 | $ 3.22
Diluted income per share | $ 1.56 | $ 0.70 | $ 0.95 | $ 1.52 | $ 1.41 | $ 0.81 | $ 0.83 | $ 1.16 |  | $ 4.73 | $ 4.22 | $ 3.15
Basic weighted average shares outstanding | 47,708 | 47,682 | 47,604 | 47,432 | 47,342 | 47,316 | 47,151 | 46,748 |  | 47,608 | 47,140 | 46,083
Diluted weighted average shares outstanding | 48,422 | 48,422 | 48,411 | 48,397 | 48,382 | 48,292 | 48,192 | 48,070 |  | 48,414 | 48,235 | 47,121
Service [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 177,548 | $ 155,454 |  |  |  |  |  |  |  | $ 333,002 |  |
University Related Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  | $ 236,818 | $ 275,681 | $ 271,418 | $ 236,209 | $ 218,301 | $ 248,206 |  | $ 512,499 | $ 974,134 | $ 873,344

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