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Line of Credit, Long-Term Debt and Capital Lease Obligations - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt instrument principal amount	$ 1,713,500	$ 1,283,500
Less: Current portion, principal	(20,000)	(10,000)
Debt instrument principal long-term portion	1,693,500	1,273,500
Unamortized debt issuance cost	(11,368)	(13,096)
Less: Current portion, unamortized debt issuance costs	0	0
Long-term portion, principal, unamortized debt issuance costs	(11,368)	(13,096)
Long term debt	1,702,132	1,270,404
Less: Current portion	(20,000)	(10,000)
Long-term portion	1,682,132	1,260,404
5.25% Senior Unsecured Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	750,000	750,000
Unamortized debt issuance cost	(11,109)	(12,695)
Long term debt	738,891	737,305
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	783,500	343,500
Long term debt	783,500	343,500
Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	180,000	190,000
Unamortized debt issuance cost	(259)	(401)
Long term debt	$ 179,741	$ 189,599

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+ 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 FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-SubTopic 210
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-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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