Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$ 25,929us-gaap_NetIncomeLoss	$ 27,968us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation & amortization	1,051us-gaap_DepreciationAndAmortization	1,184us-gaap_DepreciationAndAmortization
Deferred income taxes	865us-gaap_DeferredIncomeTaxExpenseBenefit	(106)us-gaap_DeferredIncomeTaxExpenseBenefit
Net realized (gains) losses	(5,596)us-gaap_GainLossOnSaleOfInvestments	(833)us-gaap_GainLossOnSaleOfInvestments
Changes in assets and liabilities:
Reinsurance recoverable on paid and unpaid losses and loss adjustment expenses	18,056	(11,869)
Reserves for losses and loss adjustment expenses	(17,930)	42,400
Prepaid reinsurance premiums	(6,374)	2,051
Unearned premiums	60,393	86,063
Premiums receivable	(53,878)	(91,650)
Deferred policy acquisition costs	(6,769)	(12,327)
Accrued investment income	106	(355)
Reinsurance balances payable	1,445	(22,476)
Current income tax payable, net	9,388	6,714
Accounts payable	(31,229)	(11,224)
Other	(372)	(6,698)
Net cash provided by (used in) operating activities	(4,915)	8,842
Fixed maturities
Redemptions and maturities	37,241	50,542
Sales	119,505	107,681
Purchases	(130,196)	(259,494)
Equity securities
Sales	38,343	7,935
Purchases	(12,320)	(25,473)
Change in payable for securities	15,565navg_ChangeInPayableForSecurities	(7,469)navg_ChangeInPayableForSecurities
Net change in short-term investments	(63,168)	88,353
Purchase of property and equipment	(790)	(2,991)
Net cash provided by (used in) investing activities	4,180	(40,916)
Financing activities:
Proceeds of stock issued from employee stock purchase plan		453us-gaap_ProceedsFromStockPlans
Proceeds of stock issued from exercise of stock options		153
Net cash provided by financing activities		606
Decrease in cash	(735)us-gaap_CashPeriodIncreaseDecrease	(31,468)us-gaap_CashPeriodIncreaseDecrease
Cash at beginning of year	90,751us-gaap_Cash	86,509us-gaap_Cash
Cash at end of period	90,016us-gaap_Cash	55,041us-gaap_Cash
Supplemental cash information:
Income taxes paid, net	1,793us-gaap_IncomeTaxesPaidNet	3,628us-gaap_IncomeTaxesPaidNet
Issuance of stock to directors	$ 563us-gaap_StockIssued1	$ 438us-gaap_StockIssued1

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