Capital Requirements and Restriction on Retained Earnings - Additional Information (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Net profits available to pay dividends to CBI	$ 6,863

Amount after tax of income (loss) of subsidiary attributable to the parent entity.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration