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Summary of Restricted Stock Award Activity (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Apr. 30, 2014	Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments of additional dividends	$ 1,341us-gaap_PaymentsOfDividends
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments of additional dividends		$ 396us-gaap_PaymentsOfDividends / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: