Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Estimated Future Amortization Expense [Line Items]
Balance, beginning of year	$ 2,120	$ 3,271	$ 3,435
Amortization	(70)	(1,151)	(164)
Balance, end of year	$ 2,050	$ 2,120	$ 3,271

The amount of the intangible assets arising from insurance contracts acquired in a business combination that was amortized during the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section S99

-Paragraph 2

-Subparagraph (2)

-URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904

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