Debt	6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt Senior Notes As of June 30, 2018, the Company had Senior Notes outstanding with a principal balance of $600,000. The Senior Notes mature on September 15, 2022 and bear interest at 3.95%, payable semi-annually in arrears on March 15 and September 15. The Senior Notes were issued at a discount to yield 3.97% and have been reflected net of the unamortized discount and unamortized debt issuance costs in the accompanying condensed consolidated balance sheet. Credit Agreement NVR has an unsecured Credit Agreement (the “Credit Agreement”), which provides for aggregate revolving loan commitments of $200,000 (the “Facility”). Under the Credit Agreement, the Company may request increases of up to $300,000 to the Facility in the form of revolving loan commitments or term loans to the extent that new or existing lenders agree to provide additional revolving loan or term loan commitments. The Credit Agreement provides for a $100,000 sublimit for the issuance of letters of credit, of which approximately $8,500 was outstanding at June 30, 2018, and a $25,000 sublimit for a swing line commitment. The Credit Agreement termination date is July 15, 2021. There was no debt outstanding under the Facility at June 30, 2018. Repurchase Agreement NVRM provides for its mortgage origination and other operating activities using cash generated from its operations, borrowings from its parent company, NVR, as well as a revolving mortgage repurchase agreement (the “Repurchase Agreement”), which is non-recourse to NVR. The Repurchase Agreement provides for loan purchases up to $150,000, subject to certain sub-limits. Amounts outstanding under the Repurchase Agreement are collateralized by the Company’s mortgage loans held for sale. In July 2018, NVRM entered into the Tenth Amendment (the "Amendment") to its Repurchase Agreement, filed herewith as Exhibit 10.1. The Amendment removed the $50,000 incremental commitment that was available under the prior Repurchase Agreement. All other terms and conditions under the Repurchase Agreement remained materially consistent. The Repurchase Agreement expires on July 24, 2019. At June 30, 2018, there were no borrowing base limitations reducing the amount available under the Repurchase Agreement. There was no debt outstanding under the Repurchase Agreement at June 30, 2018.

Debt

Senior Notes

As of June 30, 2018, the Company had Senior Notes outstanding with a principal balance of $600,000. The Senior Notes mature on September 15, 2022 and bear interest at 3.95%, payable semi-annually in arrears on March 15 and September 15. The Senior Notes were issued at a discount to yield 3.97% and have been reflected net of the unamortized discount and unamortized debt issuance costs in the accompanying condensed consolidated balance sheet.

Credit Agreement

NVR has an unsecured Credit Agreement (the “Credit Agreement”), which provides for aggregate revolving loan commitments of $200,000 (the “Facility”). Under the Credit Agreement, the Company may request increases of up to $300,000 to the Facility in the form of revolving loan commitments or term loans to the extent that new or existing lenders agree to provide additional revolving loan or term loan commitments. The Credit Agreement provides for a $100,000 sublimit for the issuance of letters of credit, of which approximately $8,500 was outstanding at June 30, 2018, and a $25,000 sublimit for a swing line commitment. The Credit Agreement termination date is July 15, 2021. There was no debt outstanding under the Facility at June 30, 2018.

Repurchase Agreement

NVRM provides for its mortgage origination and other operating activities using cash generated from its operations, borrowings from its parent company, NVR, as well as a revolving mortgage repurchase agreement (the “Repurchase Agreement”), which is non-recourse to NVR. The Repurchase Agreement provides for loan purchases up to $150,000, subject to certain sub-limits. Amounts outstanding under the Repurchase Agreement are collateralized by the Company’s mortgage loans held for sale.

In July 2018, NVRM entered into the Tenth Amendment (the "Amendment") to its Repurchase Agreement, filed herewith as Exhibit 10.1. The Amendment removed the $50,000 incremental commitment that was available under the prior Repurchase Agreement. All other terms and conditions under the Repurchase Agreement remained materially consistent. The Repurchase Agreement expires on July 24, 2019. At June 30, 2018, there were no borrowing base limitations reducing the amount available under the Repurchase Agreement. There was no debt outstanding under the Repurchase Agreement at June 30, 2018.