Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012 Agreement	Dec. 31, 2011
Commitments And Contingencies [Line Items]
Percentage of agreement indemnification	100.00%
Number of terminated agreement	2
Outstanding performance and surety bonds	$ 27.8	$ 27.6
Guaranteed debt	$ 30.4	$ 28.0

Percentage of Actual Capital Gains Tax Liabilities Used For Indemnification Amount

No definition available.

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Period Type:	duration