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Long-Term Debt - Long-Term Debt Instrument (Additional Information) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 5.66% | 5.66%
Debt instrument maturity year | 2016 | 2016
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 4.50% | 4.50%
Debt instrument maturity year | 2018 | 2018
4.200% senior notes, semi-annual interest payments, balloon due 2024 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 4.20% | 4.20%
Debt instrument maturity year | 2024 | 2024
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.75%, expires May 20, 2019 |  |
Debt Instrument [Line Items] |  |
Line of credit facility, expiration period | 5 years | 5 years
Line of credit facility, expiration date | May 20, 2019 | May 20, 2019
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.75%, expires May 20, 2019 | LIBOR |  |
Debt Instrument [Line Items] |  |
Debt instrument, variable interest rate | 1.75% | 1.75%
Five Year Term Loan Facility Expires In Two Thousand Ninteen Current [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 0.20% | 0.20%
Debt instrument maturity year | 2019 | 2019
5-year revolving-loan facility, periodic interest payments, currently LIBOR plus 1.50%, plus commitment fees up to 0.25%, expires May 20, 2019 |  |
Debt Instrument [Line Items] |  |
Line of credit facility, expiration period | 5 years | 5 years
Line of credit facility, commitment fee percentage | 0.25% | 0.25%
Line of credit facility, expiration date | May 20, 2019 | May 20, 2019
5-year revolving-loan facility, periodic interest payments, currently LIBOR plus 1.50%, plus commitment fees up to 0.25%, expires May 20, 2019 | LIBOR |  |
Debt Instrument [Line Items] |  |
Debt instrument, variable interest rate | 1.50% | 1.50%
Revolving credit loan, quarterly interest payments, LIBOR plus up to 1.40% and availability fee up to 0.25%, expires December 31, 2016 |  |
Debt Instrument [Line Items] |  |
Line of credit facility, expiration date | Dec. 31, 2016 | Dec. 31, 2016
Maximum | Revolving credit loan, quarterly interest payments, LIBOR plus up to 1.40% and availability fee up to 0.25%, expires December 31, 2016 |  |
Debt Instrument [Line Items] |  |
Line of credit facility, commitment fee percentage | 0.25% | 0.25%
Maximum | Revolving credit loan, quarterly interest payments, LIBOR plus up to 1.40% and availability fee up to 0.25%, expires December 31, 2016 | LIBOR |  |
Debt Instrument [Line Items] |  |
Debt instrument, variable interest rate | 1.40% | 1.40%
Wells Fargo [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 800,000 | $ 800,000

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility terminates, 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 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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