Fair Value Measurements - Estimated Fair Values of Assets Measured on Nonrecurring Basis (Parenthetical) (Detail) - Fair Value Measurements Nonrecurring [Member] - Level 3 [Member]	12 Months Ended
Dec. 31, 2016
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	1.00%
Discounted cash flow term	10 years
Terminal capitalization tate	5.00%
Discount rate	7.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	3.00%
Discounted cash flow term	15 years
Terminal capitalization tate	8.00%
Discount rate	10.00%

Discounted cash flow term.

No definition available.

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- Definition

Terminal capitalization rate.

+ References

No definition available.

+ Details

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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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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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- Definition

Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

+ References

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