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Related-Party Arrangements - Additional Information (Detail) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 31, 2015 USD ($) ft² | Oct. 31, 2013 USD ($) | Oct. 31, 2007 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Accrued interest of related party debt |  |  |  | $ 10,000,000 |  | $ 9,300,000
Interest expense on note payable principal stockholder |  |  |  | $ 714,000 | $ 721,000 |
Principal stockholder |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Loan agreement with related party |  | $ 370,000,000 | $ 350,000,000 |  |  |
Principal stockholder | Amended Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Maturity date |  |  |  | Jan. 05, 2020 |  |
Principal stockholder | Loan Arrangement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Principal amount outstanding under credit facility |  |  |  | $ 49,500,000 |  |
Amount available for future borrowings |  |  |  | $ 30,100,000 |  | $ 30,100,000
Fixed borrowing rate |  |  |  | 5.84% |  |
Related party transaction prepayment period |  |  |  | 90 days |  |
Aggregate principal amount cancelled |  |  |  | $ 105,000,000 |  |
Principal stockholder | Loan Arrangement | Maximum |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Amount prepaid for cancellation of indebtedness |  |  |  | $ 200,000,000 |  |
Principal stockholder | Loan Arrangement | Minimum |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of months advances outstanding |  |  |  | 12 months |  |
Related Party Debt | Letter Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Description of variable rate interest |  |  |  | The interest rate will increase to the one-year LIBOR calculated on the date of the initial advance or in effect on the date of default, whichever is greater, plus 5% per annum. |  |
Related Party Debt | Letter Agreement | LIBOR |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest rate (LIBOR) |  |  |  | 5.00% |  |
Mann Foundation | Sublease Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Area of office space leased | ft² | 12,500 |  |  |  |  |
Lease expiration period |  |  |  | 2017-04 |  |
Lease payment |  |  |  | $ 62,000 | $ 65,000 |
Amount of leases renewed per month | $ 21,000 |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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