v2.4.0.8

Derivative Instruments - Summary of Derivative Positions (Parenthetical) (Detail)	Jun. 30, 2013
Minimum [Member]
Derivative [Line Items]
Margin on variable-rate debt	0.30%
Maximum [Member]
Derivative [Line Items]
Margin on variable-rate debt	1.00%

X

- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration