Property, Plant and Equipment - Additional Information (Detail) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Building construction in progress	$ 50,138,000	$ 70,114,000
Assets Held For Future Use
Building construction in progress	$ 65,800,000

Carrying amount at the balance sheet date of long-lived asset under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

Name:	us-gaap_ConstructionInProgressGross
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant