Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Deferred tax assets	$ 10.8
Aggregate unremitted earnings		$ 0

Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant