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Segment Reporting - Summary Financial Information by Reporting Segment (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Bad debt expense | [1] | $ 9,607 | $ 4,269
CTU [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Bad debt expense |  | $ 2,400 |
[1] | Charges to expense include an offset for recoveries of amounts previously written off of $2.0 million for each of the quarters ended March 31, 2016 and 2015.

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