Label	Element	Value
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	$ 14,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	274,000
Comprehensive Income (Loss), Net of Tax, Excluding Loss, Attributable to Noncontrolling Interest	nhi_ComprehensiveIncomeLossNetOfTaxExcludingLossAttributableToNoncontrollingInterest	29,939,000
Comprehensive Income (Loss), Net of Tax, Excluding Loss, Attributable to Noncontrolling Interest	nhi_ComprehensiveIncomeLossNetOfTaxExcludingLossAttributableToNoncontrollingInterest	34,506,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1,065,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	989,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6,511,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6,438,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	(6,076,000)
Stock Repurchased During Period, Value	us-gaap_StockRepurchasedDuringPeriodValue	69,977,000
Stock Repurchased During Period, Value	us-gaap_StockRepurchasedDuringPeriodValue	81,974,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	466,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	241,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	486,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	231,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	47,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	85,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	81,455,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	39,050,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	91,816,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	41,266,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(115,482,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(86,053,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	34,115,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(7,854,000)
Stock Issued During Period, Value, New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	47,951,000
Additional Paid-in Capital [Member]
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	14,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	274,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6,438,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6,511,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	989,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1,065,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	(6,076,000)
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	47,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	85,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	989,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	6,497,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	706,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	48,259,000
Stock Issued During Period, Value, New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	47,944,000
AOCI Attributable to Parent [Member]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	3,516,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1,805,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	0
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	3,516,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	1,805,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	0
Parent [Member]
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	14,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	274,000
Comprehensive Income (Loss), Net of Tax, Excluding Loss, Attributable to Noncontrolling Interest	nhi_ComprehensiveIncomeLossNetOfTaxExcludingLossAttributableToNoncontrollingInterest	30,072,000
Comprehensive Income (Loss), Net of Tax, Excluding Loss, Attributable to Noncontrolling Interest	nhi_ComprehensiveIncomeLossNetOfTaxExcludingLossAttributableToNoncontrollingInterest	34,468,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	78,031,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	32,619,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6,438,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6,511,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	989,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1,065,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	(6,076,000)
Stock Repurchased During Period, Value	us-gaap_StockRepurchasedDuringPeriodValue	69,977,000
Stock Repurchased During Period, Value	us-gaap_StockRepurchasedDuringPeriodValue	81,974,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	47,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	(85,000)
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	39,050,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	91,816,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	41,266,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	81,455,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(85,850,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	34,481,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(7,658,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(114,863,000)
Stock Issued During Period, Value, New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	47,951,000
Retained Earnings, Appropriated [Member]
Comprehensive Income (Loss), Net of Tax, Excluding Loss, Attributable to Noncontrolling Interest	nhi_ComprehensiveIncomeLossNetOfTaxExcludingLossAttributableToNoncontrollingInterest	34,468,000
Comprehensive Income (Loss), Net of Tax, Excluding Loss, Attributable to Noncontrolling Interest	nhi_ComprehensiveIncomeLossNetOfTaxExcludingLossAttributableToNoncontrollingInterest	30,072,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	74,515,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	30,814,000
Stock Repurchased During Period, Value	us-gaap_StockRepurchasedDuringPeriodValue	69,965,000
Stock Repurchased During Period, Value	us-gaap_StockRepurchasedDuringPeriodValue	81,961,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	39,050,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	41,266,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	81,455,000
Dividends, Common Stock, Cash	us-gaap_DividendsCommonStockCash	91,816,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(17,301,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(10,452,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(121,348,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	$ (86,543,000)
Common Stock [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation	2,656
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation	5,765
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation	732
Stock Repurchased During Period, Value	us-gaap_StockRepurchasedDuringPeriodValue	$ 13,000
Stock Repurchased During Period, Value	us-gaap_StockRepurchasedDuringPeriodValue	$ 12,000
Stock Repurchased During Period, Shares	us-gaap_StockRepurchasedDuringPeriodShares	1,272,179
Stock Repurchased During Period, Shares	us-gaap_StockRepurchasedDuringPeriodShares	1,196,175
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	$ 0
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(12,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(13,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	$ 7,000
Stock Issued During Period, Shares, Period Increase (Decrease)	us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease	0
Stock Issued During Period, Shares, Period Increase (Decrease)	us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease	1,195,443
Stock Issued During Period, Shares, Period Increase (Decrease)	us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease	1,266,414
Stock Issued During Period, Shares, Period Increase (Decrease)	us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease	664,607
Stock Issued During Period, Shares, New Issues	us-gaap_StockIssuedDuringPeriodSharesNewIssues	661,951
Stock Issued During Period, Value, New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	$ 7,000
Noncontrolling Interest [Member]
Comprehensive Income (Loss), Net of Tax, Excluding Loss, Attributable to Noncontrolling Interest	nhi_ComprehensiveIncomeLossNetOfTaxExcludingLossAttributableToNoncontrollingInterest	(133,000)
Comprehensive Income (Loss), Net of Tax, Excluding Loss, Attributable to Noncontrolling Interest	nhi_ComprehensiveIncomeLossNetOfTaxExcludingLossAttributableToNoncontrollingInterest	38,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	100,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	35,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	486,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	466,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	241,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	231,000
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(619,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(203,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	(366,000)
Stockholders' Equity, Period Increase (Decrease)	us-gaap_StockholdersEquityPeriodIncreaseDecrease	$ (196,000)

Comprehensive Income (Loss), Net of Tax, Excluding Loss Attributable to Redeemable Noncontrolling Interest

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Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

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No definition available.

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Number of new stock issued during the period.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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