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Long-Term Debt - Long-Term Debt Instrument (Additional Information) (Detail) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Sep. 18, 2014 | Sep. 15, 2011
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage |  | 0.81% |  |
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument maturity year | 2018 | 2018 |  |
Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 4.20% |
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument maturity year | 2024 | 2024 |  |
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, expiration period | 5 years | 5 years |  |
Line of credit facility, expiration date | Jun. 28, 2022 | May 20, 2019 |  |
Five Year Term Loan Facility Expires In Two Thousand Ninteen Current [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument maturity year | 2022 | 2019 |  |
5-year revolving-loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, expiration period | 5 years | 5 years |  |
Line of credit facility, expiration date | Jun. 28, 2022 | May 20, 2019 |  |
Maximum | Term Loan [Member] | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, variable interest rate | 1.75% | 1.75% |  |
Revolving Credit Facility [Member] | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Commitment Fee Percentage | 0.25% | 0.25% |  |
Revolving Credit Facility [Member] | Maximum | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, variable interest rate | 1.50% | 1.50% |  |
Series E [Member] | Master Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 4.50%

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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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