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Supplemental Cash Flow Information - Changes in Operating Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]
Accounts receivable	$ 136,660us-gaap_IncreaseDecreaseInAccountsReceivable	$ (77,837)us-gaap_IncreaseDecreaseInAccountsReceivable	$ (132,873)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and other assets	(1,618)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	(2,386)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	19,741us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable	(17,643)us-gaap_IncreaseDecreaseInAccountsPayable	(10,877)us-gaap_IncreaseDecreaseInAccountsPayable	18,408us-gaap_IncreaseDecreaseInAccountsPayable
Accrued and other liabilities	(56,768)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	155,284us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	(20,485)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Changes in operating assets and liabilities	$ 60,631us-gaap_IncreaseDecreaseInOperatingCapital	$ 64,184us-gaap_IncreaseDecreaseInOperatingCapital	$ (115,209)us-gaap_IncreaseDecreaseInOperatingCapital

X

- Definition

The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
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X

- Definition

The increase (decrease) during the reporting period in the aggregate amount of accrued expenses and other operating obligations not separately disclosed in the statement of cash flows.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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