Long-Term Debt (Long-Term Debt) (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 1,979,565,000us-gaap_LongTermDebt	$ 2,072,975,000us-gaap_LongTermDebt
Less - current portion	(3,649,000)us-gaap_LongTermDebtCurrent	(5,385,000)us-gaap_LongTermDebtCurrent
Long-term debt and notes payable	1,975,916,000us-gaap_LongTermDebtNoncurrent	2,067,590,000us-gaap_LongTermDebtNoncurrent
Term Loan Facility [Member]
Debt Instrument [Line Items]
Total debt	660,000,000	700,000,000
Maturity date	Oct. 25, 2017
Senior Notes due 2015 [Member]
Debt Instrument [Line Items]
Total debt	175,000,000	175,000,000
Interest rate	6.22%	6.22%
Maturity date	Oct. 01, 2015
Senior Notes due 2016 [Member]
Debt Instrument [Line Items]
Total debt	100,000,000	100,000,000
Interest rate	3.30%	3.30%
Maturity date	Apr. 01, 2016
Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Total debt	50,000,000	50,000,000
Interest rate	4.00%	4.00%
Maturity date	Apr. 01, 2018
Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Total debt	175,000,000	175,000,000
Interest rate	5.25%	5.25%
Maturity date	Nov. 01, 2019
Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Total debt	100,000,000	100,000,000
Interest rate	4.64%	4.64%
Maturity date	Apr. 01, 2021
Tax-exempt Bonds [Member]
Debt Instrument [Line Items]
Total debt	31,430,000	33,030,000
2.50% to 10.9% Notes Payable to Sellers and Other Third Parties [Member]
Debt Instrument [Line Items]
Total debt	8,135,000	12,845,000
Interest rate, minimum	2.50%	2.50%
Interest rate, maximum	10.90%	10.90%
Debt, maturity date range, start	2015
Debt, maturity date range, end	2036	2036
Revolver Under Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 680,000,000	$ 727,100,000

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.22(a)(1))

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

+ References

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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- Definition

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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 210

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 20, 22

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Number 210

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

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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.

+ References

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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

Debt Instrument, Maturity Date Year Range, End

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Debt Instrument, Maturity Date Year Range, Start

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