Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 95,329us-gaap_NetIncomeLoss	$ 63,466us-gaap_NetIncomeLoss	$ 63,762us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation & amortization	4,915us-gaap_DepreciationAndAmortization	4,518us-gaap_DepreciationAndAmortization	5,931us-gaap_DepreciationAndAmortization
Deferred income taxes	16,881us-gaap_DeferredIncomeTaxExpenseBenefit	4,658us-gaap_DeferredIncomeTaxExpenseBenefit	(11,414)us-gaap_DeferredIncomeTaxExpenseBenefit
Net realized (gains) losses	(12,812)us-gaap_GainLossOnSaleOfInvestments	(22,939)us-gaap_GainLossOnSaleOfInvestments	(41,074)us-gaap_GainLossOnSaleOfInvestments
Net other-than-temporary losses recognized in earnings		2,393	858
Call premium on redemption of Senior Notes		17,895
Changes in assets and liabilities:
Reinsurance recoverable on paid and unpaid losses and loss adjustment expenses	(42,024)	68,599	(40,185)
Reserves for losses and loss adjustment expenses	114,563	(51,977)	14,369
Prepaid reinsurance premiums	10,344	(26,807)	(56,853)
Unearned premiums	52,380	72,199	109,778
Premiums receivable	(17,455)	(4,843)	(64,457)
Deferred policy acquisition costs	(12,445)	(6,002)	2,979
Accrued investment income	(925)	(1,279)	1,905
Reinsurance balances payable	(14,716)	1,439	57,114
Current income taxes	(582)	(16,432)	17,523
Other	29,039	31,987	36,503
Net cash provided by (used in) operating activities	222,492	136,875	96,739
Fixed maturities
Redemptions and maturities	210,674	237,627	188,282
Sales	362,136	648,335	1,319,404
Purchases	(864,902)	(899,930)	(1,711,080)
Equity securities
Sales	54,900	72,113	39,503
Purchases	(83,845)	(89,288)	(37,587)
Change in payable for securities	(7,814)navg_ChangeInPayableForSecurities	(46,414)navg_ChangeInPayableForSecurities	56,543navg_ChangeInPayableForSecurities
Net change in short-term investments	117,740	(142,214)	(31,568)
Purchase of property and equipment	(8,359)	(10,088)	(3,336)
Net cash provided by (used in) investing activities	(219,470)	(229,859)	(179,839)
Financing activities:
Net Proceeds from Debt Offering		263,278us-gaap_ProceedsFromIssuanceOfDebt
Redemption of 7.0% Senior Notes Due May 1, 2016		(132,437)us-gaap_EarlyRepaymentOfSeniorDebt
Proceeds of stock issued from employee stock purchase plan	1,067us-gaap_ProceedsFromStockPlans	821us-gaap_ProceedsFromStockPlans	672us-gaap_ProceedsFromStockPlans
Proceeds of stock issued from exercise of stock options	153	2,495	404
Net cash provided by (used in) financing activities	1,220	134,157	1,076
Increase (decrease) in cash	4,242us-gaap_CashPeriodIncreaseDecrease	41,173us-gaap_CashPeriodIncreaseDecrease	(82,024)us-gaap_CashPeriodIncreaseDecrease
Cash at beginning of year	86,509us-gaap_Cash	45,336us-gaap_Cash	127,360us-gaap_Cash
Cash at end of period	90,751us-gaap_Cash	86,509us-gaap_Cash	45,336us-gaap_Cash
Supplemental cash information:
Income taxes paid, net	27,066us-gaap_IncomeTaxesPaidNet	41,094us-gaap_IncomeTaxesPaidNet	19,602us-gaap_IncomeTaxesPaidNet
Interest paid	15,703us-gaap_InterestPaid	8,050us-gaap_InterestPaid	8,050us-gaap_InterestPaid
Issuance of stock to directors	$ 438us-gaap_StockIssued1	$ 400us-gaap_StockIssued1	$ 242us-gaap_StockIssued1

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with the amount received from the stock plan during the period.

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The fair value of stock issued in noncash financing activities.

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