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Contingencies - Additional Information (Detail) |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended |  |  |  |
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Apr. 26, 2015 | Jan. 13, 2014 USD ($) | Dec. 23, 2013 USD ($) | Dec. 21, 2013 USD ($) | Jan. 24, 2013 USD ($) | Aug. 11, 2011 USD ($) | Aug. 31, 2011 USD ($) | Apr. 30, 2011 USD ($) LegalMatter | Jan. 31, 2010 USD ($) | Apr. 30, 1999 USD ($) | Jun. 30, 2015 USD ($) | Nov. 11, 2014 USD ($) | Jul. 26, 2013 USD ($) | Apr. 27, 2009 USD ($) | Jul. 17, 2008 USD ($)
MGA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Historical jury verdict |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 100,000,000
Claimed trade secrets | LegalMatter |  |  |  |  |  |  |  | 26 |  |  |  |  |  |  |
Other claimed trade secrets | LegalMatter |  |  |  |  |  |  |  | 88 |  |  |  |  |  |  |
Compensatory damages awarded by jury |  |  |  |  |  |  |  | $ 88,500,000 |  |  |  |  |  |  |
Reduced compensatory damages awarded by court |  |  |  |  |  |  | $ 85,000,000 |  |  |  |  |  |  |  |
Punitive damages awarded |  |  |  |  |  |  | 85,000,000 |  |  |  |  |  |  |  |
Attorney fees and costs awarded |  |  |  |  |  |  | 140,000,000 |  |  |  |  |  |  |  |
Compensatory damages, punitive damages, and attorney fees and costs awarded by court |  |  |  |  |  |  | $ 310,000,000 |  |  |  |  |  |  |  |
Damages for alleged trade secret misappropriation appealed |  |  |  |  |  | $ 170,000,000 |  |  |  |  |  |  |  |  |
Attorney fees and costs appealed |  |  |  |  |  | $ 140,000,000 |  |  |  |  |  |  |  |  |
Amount of damages and attorney's fees and costs vacated by the appeals court |  |  |  |  | $ 172,500,000 |  |  |  |  |  |  |  |  |  |
Litigation accrual |  |  |  |  | $ 138,000,000 |  |  |  |  |  |  |  |  |  |
Payment of Judgment |  |  | $ 138,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Approximate amount of judgment finalized in the District Court, including interest |  |  |  | $ 138,000,000 |  |  |  |  |  |  |  |  |  |  |
Reasonably possible range of loss, minimum |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Reasonably possible range of loss, maximum |  |  |  |  |  |  |  |  |  |  | 12,500,000 |  |  |  |
Reasonably possible range of pre-judgment interest, minimum |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Reasonably possible range of pre-judgment interest, maximum |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |
Accrued litigation liability |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
MGA | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alleged trade secrets damages claimed |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Yellowstone |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reasonably possible range of loss, minimum |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Reasonably possible range of loss, maximum |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |
Alleged loss of profits |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |
Unpaid accounts receivable |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |
Alleged business investments |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |
Initial court appointed expert estimated loss of profits |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |
Court awarded damages from counterclaim |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |
Damages awarded by Appeals Court including inflation and interest |  |  |  |  |  |  |  |  |  |  |  | $ 14,500,000 | $ 17,000,000 |  |
Counterclaim Awarded By Appeals Court |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 | $ 7,500,000 | $ 7,500,000 |  |
Percentage of fine imposed on value of the claims made | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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