Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Actual ratio of total interest expense to earnings before interest and taxes.

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No definition available.

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Actual ratio of total debt to earnings before interest, taxes, depreciation and amortization.

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Debt issuance costs, amortization period.

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Date the credit facility matures

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Line of credit facility increased maximum borrowing capacity.

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Maximum limit of aggregate principal amount of senior notes outstanding under the master note purchase agreement.

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Required ratio of total debt to earnings before interest, taxes, depreciation and amortization during material acquisition period.

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Required ratio of total debt to earnings before interest, taxes, depreciation and amortization.

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Required ratio of total interest expense to earnings before interest and taxes.

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Revolving Credit Term Loan Maximum Borrowing Capacity

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Long-Term Debt (Narrative) (Detail) (USD $)	12 Months Ended			45 Months Ended	3 Months Ended	2 Months Ended	0 Months Ended
Long-Term Debt (Narrative) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Jan. 08, 2014	Sep. 03, 2014	Jan. 26, 2015	Oct. 31, 2012	Oct. 01, 2008	Oct. 26, 2009	Apr. 01, 2011
Debt Instrument [Line Items]
Long term debt	$ 1,979,565,000us-gaap_LongTermDebt	$ 2,072,975,000us-gaap_LongTermDebt		$ 1,979,565,000us-gaap_LongTermDebt
Repayment of principal and accrued interest on debt	525,909,000us-gaap_RepaymentsOfLongTermDebt	493,560,000us-gaap_RepaymentsOfLongTermDebt	609,014,000us-gaap_RepaymentsOfLongTermDebt
Debt issuance costs	125,000us-gaap_PaymentsOfDebtIssuanceCosts	2,035,000us-gaap_PaymentsOfDebtIssuanceCosts	7,174,000us-gaap_PaymentsOfDebtIssuanceCosts
Revolver Under Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility	1,200,000,000	1,200,000,000		1,200,000,000
Maximum amount of increase in commitments under the revolving credit facility	1,500,000,000
Long term debt	680,000,000	727,100,000		680,000,000
Amount of standby letters of credit outstanding	73,031,000	75,166,000		73,031,000
Revolving credit facility maturing	2018-05
Commitment fee	0.20%	0.23%
Actual leverage ratio	2.67	3.08		2.67
Actual interest coverage ratio	7.94	6.33		7.94
Unamortized debt issuance costs	3,632,000			3,632,000
Debt issuance costs	4,722,000
Revolver Under Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Long term debt	677,000,000	720,000,000		677,000,000
Interest rate on loans	1.54%	1.67%		1.54%
Margin rate for loans	1.375%	1.50%
Interest rate on bond at December 31, 2014	1.54%	1.67%		1.54%
Revolver Under Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Required interest coverage ratio	2.75
Revolver Under Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Required leverage ratio	3.50
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long term debt	660,000,000	700,000,000		660,000,000
Actual leverage ratio	2.67	3.08		2.67
Actual interest coverage ratio	7.94	6.33		7.94
Debt principal amount								800,000,000
Maturity date	Oct. 25, 2017
Unamortized debt issuance costs	3,809,000			3,809,000
Aggregate principal amount								800,000,000
Debt issuance costs	7,370,000
Term Loan Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate on loans	1.66%	2.04%		1.66%
Margin rate for loans	1.50%	1.875%
Interest rate on bond at December 31, 2014	1.66%	2.04%		1.66%
Term Loan Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Required interest coverage ratio	2.75
Term Loan Facility [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Margin rate for loans	1.25%
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Required leverage ratio	3.50
Term Loan Facility [Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Margin rate for loans	2.00%
Term Loan Facility [Member] \| Revolver Under Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	7,441,000			7,441,000
Senior Notes due 2015 [Member]
Debt Instrument [Line Items]
Long term debt	175,000,000	175,000,000		175,000,000
Debt principal amount									175,000,000
Maturity date	Oct. 01, 2015
Debt issuance costs amortization period	7 years
Aggregate principal amount									175,000,000
Interest rate	6.22%	6.22%		6.22%
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Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Long term debt	175,000,000	175,000,000		175,000,000
Debt principal amount										175,000,000
Maturity date	Nov. 01, 2019
Debt issuance costs amortization period	10 years
Aggregate principal amount										175,000,000
Interest rate	5.25%	5.25%		5.25%
Debt issuance costs	152,000
Senior Notes due 2016, 2018 and 2021 [Member]
Debt Instrument [Line Items]
Debt principal amount											250,000,000
Aggregate principal amount											250,000,000
Debt issuance costs				1,489,000
Senior Notes due 2016 [Member]
Debt Instrument [Line Items]
Long term debt	100,000,000	100,000,000		100,000,000
Debt principal amount											100,000,000
Maturity date	Apr. 01, 2016
Aggregate principal amount											100,000,000
Interest rate	3.30%	3.30%		3.30%
Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Long term debt	50,000,000	50,000,000		50,000,000
Debt principal amount											50,000,000
Maturity date	Apr. 01, 2018
Aggregate principal amount											50,000,000
Interest rate	4.00%	4.00%		4.00%
Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Long term debt	100,000,000	100,000,000		100,000,000
Debt principal amount											100,000,000
Maturity date	Apr. 01, 2021
Aggregate principal amount											100,000,000
Interest rate	4.64%	4.64%		4.64%
Tax-exempt Bonds [Member]
Debt Instrument [Line Items]
Long term debt	31,430,000	33,030,000		31,430,000
Senior Notes [Member]
Debt Instrument [Line Items]
Margin rate for loans	0.50%
Actual leverage ratio	2.67	3.08		2.67
Actual interest coverage ratio	7.94	6.33		7.94
Maximum limit of aggregate principal amount of notes outstanding	1,250,000,000
Senior Notes [Member] \| Minimum [Member]
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Required interest coverage ratio	2.75
Prepayment of notes, minimum percentage of outstanding principal amount	5.00%
Senior Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Required leverage ratio	3.75
Swing Line Loans [Member] \| Revolver Under Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt	3,000,000	7,100,000		3,000,000
Swing Line Loans [Member] \| Revolver Under Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate on loans	3.63%	3.75%		3.63%
Margin rate for loans	0.50%	0.50%
Interest rate on bond at December 31, 2014	3.63%	3.75%		3.63%
Sub Limit Swing Line Loans [Member] \| Revolver Under Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Long term debt	25,000,000			25,000,000
New Revolving Credit And Term Loan Agreement [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	6,874,000			6,874,000
Tehama Bond [Member]
Debt Instrument [Line Items]
Repayment of principal and accrued interest on debt					205,000
Tehama Bond [Member] \| Tax-exempt Bonds [Member]
Debt Instrument [Line Items]
Maturity date	Jun. 01, 2014
San Jose Bond Series 2001 A [Member]
Debt Instrument [Line Items]
Repayment of principal and accrued interest on debt						1,395,000
Subsequent Event [Member] \| New Revolving Credit And Term Loan Agreement [Member]
Debt Instrument [Line Items]
Credit facility							1,200,000,000
Revolving credit term loan maximum borrowing capacity							2,300,000,000
Debt principal amount							800,000,000
Maturity date							Jan. 24, 2020
Aggregate principal amount							800,000,000
Subsequent Event [Member] \| New Revolving Credit And Term Loan Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Required interest coverage ratio							2.75
Subsequent Event [Member] \| New Revolving Credit And Term Loan Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Required leverage ratio							3.50
Reguired leverage ratio during material acquisition period							3.75
Subsequent Event [Member] \| New Revolving Credit And Term Loan Agreement [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Revolving credit term loan maximum borrowing capacity							250,000,000
Subsequent Event [Member] \| New Revolving Credit And Term Loan Agreement [Member] \| Letter of Credit [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Margin rate for loans							1.00%
Subsequent Event [Member] \| New Revolving Credit And Term Loan Agreement [Member] \| Letter of Credit [Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Margin rate for loans							1.50%
Subsequent Event [Member] \| New Revolving Credit And Term Loan Agreement [Member] \| Swing Line Loans [Member]
Debt Instrument [Line Items]
Revolving credit term loan maximum borrowing capacity							$ 35,000,000
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Debt Instrument [Line Items]
Margin rate for loans							0.00%
Subsequent Event [Member] \| New Revolving Credit And Term Loan Agreement [Member] \| Swing Line Loans [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Margin rate for loans							0.50%