Credit Facility, Increase, Maximum Borrowing Amount

No definition available.

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- Definition

Debt Instrument, Covenant Compliance, Leverage Ratio, Maximum, Period One

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant Compliance, Leverage Ratio, Maximum, Period Two

+ References

No definition available.

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- Definition

Debt Instrument, Covenant Compliance, Leverage Ratio, Maximum, Thereafter

+ References

No definition available.

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- Definition

Debt Instrument, Redemption, Amount

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Long-term Debt, Maturities, Gross Repayments of Principal in Next Twelve Months

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Long-term Debt, Maturities, Gross Repayments of Principal in Year Three

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Long-term Debt, Maturities, Gross Repayments of Principal in Year Two

+ References

No definition available.

+ Details

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- Definition

Shelf Registration Statement Maximum Amount Of securities Authorized For Issuance

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Period Type:	duration

- 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.

+ Details

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Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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Long-term debt - Narrative (Detail)			12 Months Ended
Long-term debt - Narrative (Detail)	Sep. 30, 2016 USD ($)	Apr. 01, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 28, 2014 USD ($)	Nov. 01, 2016 USD ($)	Sep. 26, 2016 USD ($)	Sep. 23, 2015 USD ($)
Debt Instrument [Line Items]
Proceeds from borrowings			$ 300,000,000	$ 200,000,000	$ 666,732,000
Shelf registration statement maximum amount of securities authorized for issuance			7,000,000,000
Contractual debt maturities, 2017			132,000,000
Contractual debt maturities, 2018			121,000,000
Contractual debt maturities, 2019			$ 121,000,000
Unsecured notes bearing fixed rate interest at 10% due April 2016
Debt Instrument [Line Items]
Repayments of long-term debt		$ 203,100,000
Interest rate stated percentage		10.00%	10.00%
Unsecured floating rate term loan due quarterly through September 2020
Debt Instrument [Line Items]
Proceeds from borrowings	$ 300,000,000
Debt term	4 years
Unsecured notes bearing fixed rate interest at 7.125% due September 2018
Debt Instrument [Line Items]
Interest rate stated percentage			7.125%			7.125%
Redemption of bonds						$ 70,000,000
Line of Credit \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Maximum total leverage ratio through June 30, 2017				5.0
Maximum total leverage ratio through June 30, 2018				4.75
Maximum total leverage ratio, thereafter				4.50
Maximum borrowing capacity								$ 1,500,000,000.0
Line of Credit \| Minimum \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Commitment fee percentage				0.25%
Line of Credit \| Maximum \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Commitment fee percentage				0.40%
Line of Credit \| Federal Funds Rate \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.50%
Line of Credit \| LIBOR \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.00%
Line of Credit \| LIBOR \| Minimum \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.75%
Line of Credit \| LIBOR \| Maximum \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				2.50%
Line of Credit \| ABR \| Minimum \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.75%
Line of Credit \| ABR \| Maximum \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Unused borrowing capacity			$ 844,000,000
Revolving Credit Facility \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Increase in borrowing capacity							$ 103,000,000