Segment information - Selected Statement of Operations and Income (Loss) Information Related to Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 531,906	$ 446,838	$ 980,778	$ 840,414
Depreciation and amortization	7,274	5,055	14,379	9,450
Income (loss) before taxes and noncontrolling interests	31,032	11,536	12,157	(7,050)
Operating Segments \| Title
Segment Reporting Information [Line Items]
Revenues	468,985	406,018	849,354	770,227
Depreciation and amortization	2,151	1,446	4,206	2,814
Income (loss) before taxes and noncontrolling interests	72,769	45,621	92,401	63,451
Operating Segments \| Mortgage Services
Segment Reporting Information [Line Items]
Revenues	58,031	35,820	121,741	61,076
Depreciation and amortization	2,897	1,860	5,754	2,979
Income (loss) before taxes and noncontrolling interests	(3,346)	(2,323)	(691)	(4,246)
Operating Segments \| Corporate
Segment Reporting Information [Line Items]
Revenues	4,890	5,000	9,683	9,111
Depreciation and amortization	2,226	1,749	4,419	3,657
Income (loss) before taxes and noncontrolling interests	(38,391)	(31,762)	(79,553)	(66,255)
Intersegment Eliminations \| Mortgage Services
Segment Reporting Information [Line Items]
Revenues	$ 241	$ 104	$ 481	$ 209

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=51673353&loc=d3e41242-110953

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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