Debt - $400 Million 5% Senior Notes - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2016	Jun. 05, 2015
$400 Million 5% Senior Notes [Member]
Debt Instrument [Line Items]
Maturity date	Apr. 15, 2023
Senior notes, principal amount	$ 400,000,000
Interest rate of Senior Notes	5.00%
First semi-annual interest payment date	--04-15
Second semi-annual interest payment date	--10-15
Percentage of principal amount plus accrued and unpaid interest	100.00%
Net proceeds from issuance of senior notes	$ 392,000,000
$400 Million 5% Senior Notes [Member] \| Redemption Period One [Member]
Debt Instrument [Line Items]
Redemption price expressed as percentage	103.75%
Redemption date	Apr. 15, 2018
$400 Million 5% Senior Notes [Member] \| Redemption Period Two [Member]
Debt Instrument [Line Items]
Redemption price expressed as percentage	102.50%
Redemption date	Apr. 15, 2019
$400 Million 5% Senior Notes [Member] \| Redemption Period Three [Member]
Debt Instrument [Line Items]
Redemption price expressed as percentage	101.25%
Redemption date	Apr. 15, 2020
$400 Million 5% Senior Notes [Member] \| Redemption Period Four [Member]
Debt Instrument [Line Items]
Redemption price expressed as percentage	100.00%
Redemption date	Apr. 15, 2021
Senior Secured Term Loan Facility [Member] \| $1 Billion Credit Facility [Member]
Debt Instrument [Line Items]
Total credit facility		$ 300,000,000

Date of first semiannual interest payment.

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Date of second semiannual interest payment.

+ References

No definition available.

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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

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-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Start date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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Percentage of principal amount of debt redeemed.

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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

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

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