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Deferred Policy Acquisition costs - Schedule of the Activity in the Deferred Policy Acquisition Costs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 19,171us-gaap_DeferredPolicyAcquisitionCosts	$ 18,419us-gaap_DeferredPolicyAcquisitionCosts	$ 16,578us-gaap_DeferredPolicyAcquisitionCosts
Policy acquisition costs deferred	44,295	41,278	40,961
Amortization expense during the year	(43,817)	(40,526)	(39,120)
Balance, end of year	$ 19,649us-gaap_DeferredPolicyAcquisitionCosts	$ 19,171us-gaap_DeferredPolicyAcquisitionCosts	$ 18,419us-gaap_DeferredPolicyAcquisitionCosts

Amount of expense related to deferred policy acquisition costs.

Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date.