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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Organization And Operations [Line Items] |  |  |
Accounts receivable, net of allowances for doubtful accounts | $ 229,885 | $ 234,456 |
Accounts receivable, allowances for doubtful accounts | $ 1,580 | $ 459 |
Percentage of likelihood required for a tax position to be measured | 50.00% |  |
Government Contracts Concentration Risk | Sales Revenue, Net | Federal Correctional And Detention Authorities |  |  |
Organization And Operations [Line Items] |  |  |
Percentage of revenues generated from government management contracts | 52.00% | 51.00% | 44.00%
Government Contracts Concentration Risk | Sales Revenue, Net | Federal Bureau Of Prisons |  |  |
Organization And Operations [Line Items] |  |  |
Percentage of revenues generated from government management contracts | 9.00% | 11.00% | 13.00%
Government Contracts Concentration Risk | Sales Revenue, Net | United States Marshals Service |  |  |
Organization And Operations [Line Items] |  |  |
Percentage of revenues generated from government management contracts | 15.00% | 16.00% | 17.00%
Government Contracts Concentration Risk | Sales Revenue, Net | United States Immigration And Customs Enforcement |  |  |
Organization And Operations [Line Items] |  |  |
Percentage of revenues generated from government management contracts | 28.00% | 24.00% | 13.00%
Government Contracts Concentration Risk | Sales Revenue, Net | State Correctional Authorities |  |  |
Organization And Operations [Line Items] |  |  |
Percentage of revenues generated from government management contracts | 38.00% | 40.00% | 46.00%
Government Contracts Concentration Risk | Sales Revenue, Net | State of California Department of Corrections and Rehabilitation |  |  |
Organization And Operations [Line Items] |  |  |
Percentage of revenues generated from government management contracts | 6.00% | 10.00% | 12.00%
Minimum |  |  |
Organization And Operations [Line Items] |  |  |
Renewal of contract terms | 2 years |  |
Maximum |  |  |
Organization And Operations [Line Items] |  |  |
Renewal of contract terms | 5 years |  |

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