Debt - Summary of Debt (Detail) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt issuance costs	$ (3,185)	$ (3,580)
Total debt	1,194,109	1,088,018
Long-term debt	$ 1,194,109	1,088,018
Revolving Credit Facility [Member] \| Non-public [Member]
Debt Instrument [Line Items]
Maturity Date	Jun. 08, 2023
Line of credit	$ 170,000	207,000
Interest Rate, Term	Variable
Interest Paid	Varies
7.00% Senior Notes 4/15/2019 [Member] \| Public [Member]
Debt Instrument [Line Items]
Maturity Date	Apr. 15, 2019
Interest Rate	7.00%
Senior Notes	$ 110,000	110,000
Unamortized discount on Senior Notes	$ (143)	(332)
Interest Paid	Semi-annually
Term Loan Facility [Member]
Debt Instrument [Line Items]
Maturity Date	Jun. 07, 2021
Term Loan Facility [Member] \| Non-public [Member]
Debt Instrument [Line Items]
Maturity Date	Jun. 07, 2021
Term Loan Facility(1)	$ 292,500	300,000
Interest Rate, Term	Variable
Interest Paid	Varies
3.28% Senior Notes 2/27/2023 [Member] \| Non-public [Member]
Debt Instrument [Line Items]
Maturity Date	Feb. 27, 2023
Interest Rate	3.28%
Senior Notes	$ 125,000	125,000
Interest Paid	Semi-annually
3.80% Senior Notes 11/25/2025 [Member] \| Public [Member]
Debt Instrument [Line Items]
Maturity Date	Nov. 25, 2025
Interest Rate	3.80%
Senior Notes	$ 350,000	350,000
Unamortized discount on Senior Notes	$ (63)	$ (70)
Interest Paid	Semi-annually
3.96% Senior Notes 3/21/2030 [Member] \| Non-public [Member]
Debt Instrument [Line Items]
Maturity Date	Mar. 21, 2030
Interest Rate	3.96%
Senior Notes	$ 150,000
Interest Paid	Quarterly

Debt instrument frequency of periodic interest payment.

No definition available.

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- Definition

Term loan.

+ References

No definition available.

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Balance Type:	credit
Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22(a)(2))
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- Definition

Amount, after accumulated amortization, of debt discount.

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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Balance Type:	debit
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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.

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+ Details

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Balance Type:	credit
Period Type:	instant

- 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts 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

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- Definition

Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

+ Details

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