Income taxes - Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Tax credit carryforwards	$ 20,242	$ 26,792
Accrued expenses	20,190	17,241
Net operating loss (NOL) carryforwards	6,428	4,260
Foreign currency translation adjustments	5,220	411
Allowance for uncollectible amounts	3,524	3,379
Investments	3,369	1,582
Fixed assets	2,094	5,860
Other	1,954	2,127
Deferred tax assets – gross	63,021	61,652
Valuation allowance	(2,217)	(2,564)
Deferred tax assets – net	60,804	59,088
Deferred tax liabilities:
Amortization – goodwill and other intangibles	(27,991)	(34,740)
Title loss provisions	(18,523)	(23,365)
Unrealized gains on investments	(4,811)	(7,953)
Deferred compensation on life insurance policies	(3,558)	(3,239)
Other	(2,328)	(2,476)
Deferred tax liabilities – gross	(57,211)	(71,773)
Net deferred income tax assets (liabilities)	$ 3,593
Net deferred income tax assets (liabilities)		$ (12,685)