Geographical Data for Operations (Parenthetical) (Detail) (Discontinued operations, USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Discontinued operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Other non-current assets	$ 15,432	$ 33,001	$ 31,897

Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

No definition available.

Name:	us-gaap_OtherAssetsMiscellaneousNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant