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Quarterly Results of Operations (Unaudited) - Summarizes the Unaudited Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 162,443 | $ 152,399 | $ 141,463 | $ 142,030 | $ 141,298 | $ 133,568 | $ 119,260 | $ 117,131 |  |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Instructional costs and services | 67,971 | 64,704 | 61,747 | 59,997 | 58,819 | 57,354 | 53,406 | 50,824 | 254,419 | 220,403 | 194,801
Admissions advisory and related | 26,160 | 24,578 | 23,346 | 22,993 | 23,215 | 22,342 | 20,369 | 19,991 | 97,077 | 85,917 | 70,758
Advertising | 15,038 | 15,498 | 14,520 | 15,929 | 13,008 | 12,909 | 11,467 | 13,639 | 60,985 | 51,023 | 45,587
Marketing and promotional | 1,527 | 1,299 | 1,383 | 1,435 | 1,313 | 1,199 | 919 | 929 |  |  |
General and administrative | 10,870 | 9,035 | 8,978 | 8,051 | 11,696 | 8,561 | 7,701 | 7,544 | 36,934 | 35,502 | 29,043
Total costs and expenses | 121,566 | 115,114 | 109,974 | 108,405 | 108,051 | 102,365 | 93,862 | 92,927 | 455,059 | 397,205 | 344,581
Operating income | 40,877 | 37,285 | 31,489 | 33,625 | 33,247 | 31,203 | 25,398 | 24,204 | 143,276 | 114,052 | 82,160
Interest expense | (609) | (528) | (439) | (668) | (260) | (154) | (78) | (207) |  |  |
Interest and other income | 104 | 1,502 | 62 | 2,195 | 19 | 16 | 26 | 10 |  |  |
Income before income taxes | 40,372 | 38,259 | 31,112 | 35,152 | 33,006 | 31,065 | 25,346 | 24,007 | 144,895 | 113,424 | 81,528
Income tax expense | 14,215 | 15,714 | 12,048 | 14,207 | 12,097 | 12,594 | 9,748 | 9,538 | 56,184 | 43,977 | 30,982
Net income | $ 26,157 | $ 22,545 | $ 19,064 | $ 20,945 | $ 20,909 | $ 18,471 | $ 15,598 | $ 14,469 | $ 88,711 | $ 69,447 | $ 50,546
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic income per share | $ 0.58 | $ 0.50 | $ 0.43 | $ 0.47 | $ 0.47 | $ 0.42 | $ 0.35 | $ 0.33 | $ 1.98 | $ 1.57 | $ 1.13
Diluted income per share | $ 0.56 | $ 0.49 | $ 0.42 | $ 0.46 | $ 0.46 | $ 0.41 | $ 0.35 | $ 0.32 | $ 1.92 | $ 1.53 | $ 1.12
Basic weighted average shares outstanding | 45,026 | 44,963 | 44,681 | 44,242 | 44,167 | 44,365 | 44,447 | 44,371 | 44,731 | 44,332 | 44,631
Diluted weighted average shares outstanding | 46,712 | 46,424 | 45,929 | 45,449 | 45,364 | 45,339 | 45,169 | 45,151 | 46,131 | 45,251 | 45,105

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- Definition Costs directly attributable to educational services, including salaries and benefits for full-time faculty, administrators and academic advisors, and costs associated with adjunct faculty. Also includes costs for educational supplies such as books, costs associated with academic records and graduation, costs associated with collections from our students such as bad debt expense, and other university services such as evaluating transcripts. + References No definition available. + Details
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