This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(b))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 2
-Subparagraph (SX 210.9-06)
-URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884

Name:	us-gaap_CashDividendsPaidToParentCompany
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Schedule I - Parent Company Financial Information - Additional Information (Detail) - USD ($) $ in Thousands			1 Months Ended	12 Months Ended
	Apr. 27, 2016	Jan. 26, 2016	Apr. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Dividends paid by guaranty				$ 20,000	$ 15,000	$ 25,000
Interest paid				3,020	1,873	2,616
Additional cash issued to class B common stock holders				12,000	$ 0	$ 0
Conversion, Class B Common Stock To Common Stock
Condensed Financial Statements, Captions [Line Items]
Additional cash issued to class B common stock holders	$ 12,000	$ 12,000	$ 12,000	$ 12,000