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Long-Term Debt - Narrative (Detail) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
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Dec. 21, 2018 USD ($) | May 20, 2014 USD ($) extension | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2019 USD ($) | Nov. 15, 2018 USD ($) | May 10, 2018 USD ($) | Jun. 28, 2017 USD ($) | Dec. 22, 2016 USD ($) | Jan. 15, 2015 USD ($) | Sep. 18, 2014 USD ($) | Apr. 17, 2014 USD ($) | Sep. 15, 2011 USD ($) | Feb. 01, 2008 USD ($) | Dec. 22, 2006 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Noncurrent, Net |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  | $ 965,000,000 |  |  | $ 965,000,000 | $ 365,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving and term loan |  |  |  |  |  | 1,015,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Potential increased in line of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |
Unsecured revolving credit facility |  |  | 350,000,000.0 |  |  | 350,000,000.0 |  |  |  | $ 600,000,000.0 |  | $ 400,000,000.0 |  |  |  | 800,000,000.0 |  |  |
Debt Instrument, Periodic Payment, Principal |  |  | 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans |  |  | 365,000,000.0 |  |  | 365,000,000.0 |  |  |  |  |  |  |  |  |  | 550,000,000.0 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | 55,000,000.0 |  |  | 55,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  |  |  |  | 600,000,000 | 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |
Outstanding debt balance |  |  | 1,506,990,000 |  |  | 1,506,990,000 | $ 976,141,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due Two Thousand Sixteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  |  |  |  |
5.370% senior notes, Series D, quarterly interest payments, balloon due 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of senior notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extension periods | extension |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension period |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,350,000,000.0 |  |  |
Unsecured Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.20% |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |  |
Outstanding debt balance |  |  | 500,000,000.0 |  |  | 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  | $ 550,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  |  | 67,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans |  |  | $ 300,000,000.0 |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  | $ 375,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  | $ 475,000,000.0 |  |  |  |
Master Agreement | Series C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 | $ 25,000,000.0
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.66%
Master Agreement | Series D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.37% |
Master Agreement | Series E |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding |  |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  | $ 100,000,000.0 |  |
Debt Instrument, Periodic Payment, Interest |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |
Long-term Debt, Contingent Payment of Principal or Interest |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
30-day Adjusted LIBOR Rate |  |  | 2.50% |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
30-day Adjusted LIBOR Rate |  |  | 2.563% |  |  | 2.563% |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR | Long-term Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
30-day Adjusted LIBOR Rate |  |  | 2.288% |  |  | 2.288% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans | 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility fee |  |  |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | LIBOR | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | LIBOR | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  |  |  | 0.85% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans | $ 450,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility fee |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | LIBOR | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | LIBOR | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  |  |  |  |  |  |  | $ 3,800,000 |  |  |  |  |  |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -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 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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 + Details
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