Long-Term Debt (Long-Term Debt) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 2,157,285	$ 1,979,565
Less - current portion	(2,127)	(3,649)
Less - debt issuance costs	(8,031)	(4,764)
Long-term debt and notes payable	2,147,127	1,971,152
Revolver Under Credit Agreement [Member]
Debt Instrument [Line Items]
Total debt	390,000	680,000
Term Loan Under Credit Agreement [Member]
Debt Instrument [Line Items]
Total debt	$ 800,000	660,000
Senior Notes due 2015 [Member]
Debt Instrument [Line Items]
Total debt		$ 175,000
Interest rate	6.22%	6.22%
Maturity date	Oct. 01, 2015
Senior Notes due 2016 [Member]
Debt Instrument [Line Items]
Total debt	$ 100,000	$ 100,000
Interest rate	3.30%	3.30%
Maturity date	Apr. 01, 2016
Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Total debt	$ 50,000	$ 50,000
Interest rate	4.00%	4.00%
Maturity date	Apr. 01, 2018
Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Total debt	$ 175,000	$ 175,000
Interest rate	5.25%	5.25%
Maturity date	Nov. 01, 2019
Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Total debt	$ 100,000	$ 100,000
Interest rate	4.64%	4.64%
Maturity date	Apr. 01, 2021
Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Total debt	$ 125,000
Interest rate	3.09%
Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Total debt	$ 375,000
Interest rate	3.41%
Tax-exempt Bonds [Member]
Debt Instrument [Line Items]
Total debt	$ 31,430	$ 31,430
Notes Payable to Sellers and Other Third Parties [Member]
Debt Instrument [Line Items]
Total debt	$ 10,855	$ 8,135
Interest rate, minimum	3.00%
Interest rate, maximum	10.90%	10.90%
Debt, maturity date range, start	2016
Debt, maturity date range, end	2036	2036

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02.22(a)(2))
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt Instrument, Maturity Date Year Range, End

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Debt Instrument, Maturity Date Year Range, Start

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