Goodwill and acquired intangibles - Summary of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Goodwill summary
Beginning balances	$ 231,838us-gaap_Goodwill	$ 220,955us-gaap_Goodwill
Acquisitions	21,440us-gaap_GoodwillAcquiredDuringPeriod	10,883us-gaap_GoodwillAcquiredDuringPeriod
Sale of assets	(1,410)
Ending balances	251,868us-gaap_Goodwill	231,838us-gaap_Goodwill
Title
Goodwill summary
Beginning balances	198,727	198,699
Acquisitions	3,275	28
Sale of assets	0
Ending balances	202,002	198,727
Mortgage Services
Goodwill summary
Beginning balances	33,111	22,256
Acquisitions	18,165	10,855
Sale of assets	(1,410)
Ending balances	$ 49,866	$ 33,111

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

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-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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