Nature of Operations and Basis of Presentation - Additional Information (Detail)	9 Months Ended
Sep. 30, 2017 Country Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of countries in which the company has operations	34
Number of countries in which the company does business through a network of correspondent brokers and consultants	150
Number of reportable segments \| Segment	3

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration