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Financial Instruments (Interest Rate Swaps) - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Interest Rate Swap [Member] | June 2015 [Member]
Schedule of Available-for-sale Securities [Line Items]
Interest rate swap, expiration date	2015-06	2015-06

X

- Definition

Derivative maturity month and year.

+ References

No definition available.

+ Details

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X

- 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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Balance Type:	na
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: