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LONG-TERM DEBT (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Scheduled maturities for long-term debt [Abstract]  
2011$ (1,034,000)[1] 
2012134,822,000 
2013285,405,000 
2014128,513,000 
2015251,039,000 
Long-term Debt, maturing through 2015798,745,000 
Thereafter4,388,183,000 
Long-term Debt, gross5,186,928,000 
Unamortized Premium (Discount) Amount(12,557,000) 
Total Debt5,174,371,000 
Financing Transactions [Abstract]  
Net proceeds from issuance386,784,000660,711,000
NVE Holding Co. [Member]
  
Scheduled maturities for long-term debt [Abstract]  
20110 
20120 
20130 
20140 
20150 
Long-term Debt, maturing through 20150 
Thereafter506,500,000 
Long-term Debt, gross506,500,000 
Unamortized Premium (Discount) Amount0 
Total Debt506,500,000 
NVE Holding Co. [Member] | Term Loan [Member]
  
Financing Transactions [Abstract]  
Issuance dateOctober 7, 2011 
Face amount195,000,000 
Duration of loan agreement (in years)3 
Maturity dateOctober 7, 2014 
Description of variable rate basis
The borrowing under the Term Loan will bear interest at the LIBOR rate plus a margin. The current LIBOR rate margin is 2.00%
 
Effective interest rate (in hundredths)2.81% 
Covenant description(i) a financial covenant to maintain a ratio of total consolidated indebtedness to total consolidated capitalization, determined on the last day of each fiscal quarter ending on and after September 30, 2011, not to exceed 0.70 to 1.00 and (ii) a fixed charge covenant that requires NVE not to permit the fixed charge coverage ratio, determined on the last day of each fiscal quarter ending on and after September 30, 2011, to be less than 1.50 to 1.00. 
NVE Holding Co. [Member] | Senior Notes [Member]
  
Financing Transactions [Abstract]  
Effective interest rate (in hundredths)6.75% 
Percentage of stated principal amount plus accrued interest at which Notes will be redeemed (in hundredths)102.25% 
Redemption notice dateOctober 7, 2011 
Aggregate principal amount paid191,500,000 
NPC [Member]
  
Scheduled maturities for long-term debt [Abstract]  
2011(1,034,000)[1] 
2012134,822,000 
201335,405,000 
2014128,513,000 
2015251,039,000 
Long-term Debt, maturing through 2015548,745,000 
Thereafter2,965,266,000 
Long-term Debt, gross3,514,011,000 
Unamortized Premium (Discount) Amount(25,828,000) 
Total Debt3,488,183,000 
Financing Transactions [Abstract]  
Net proceeds from issuance386,884,000637,975,000
Notional amount of interest rate swap250,000,000 
Swap Transaction Settlement DateJune 1, 2011 
Settlement payment amount14,900,000 
NPC [Member] | General and Refunding Mortgage Notes, Series Y [Member]
  
Financing Transactions [Abstract]  
Issuance dateMay 12, 2011 
Face amount250,000,000 
Maturity dateMay 15, 2041 
Effective interest rate (in hundredths)5.45% 
Net proceeds from issuance248,000,000 
Cash from issuance of G and R mortgage notes248,000,000 
NPC [Member] | General and Refunding Mortgage Notes, Series A [Member]
  
Financing Transactions [Abstract]  
Maturity dateJune 1, 2011 
Aggregate principal amount paid350,000,000 
SPPC [Member]
  
Scheduled maturities for long-term debt [Abstract]  
20110 
20120 
2013250,000,000 
20140 
20150 
Long-term Debt, maturing through 2015250,000,000 
Thereafter916,417,000 
Long-term Debt, gross1,166,417,000 
Unamortized Premium (Discount) Amount13,271,000 
Total Debt1,179,688,000 
Financing Transactions [Abstract]  
Net proceeds from issuance$ 0$ 22,736,000
[1]Amounts may differ from current portion of long-term debt as reported on the consolidated balance sheet due to the timing difference of payments and the change in obligation.