Nature of Business and Financial Statement Presentation - Additional Information (Detail) - Accounting Standards Update (“ASU”) No. 2015-02 $ in Millions	Mar. 31, 2016 USD ($) Entity	Dec. 31, 2015 USD ($) Entity
Nature Of Business And Financial Statement Presentation [Line Items]
Number of entities considered VIE \| Entity	3	3
Maximum exposure to losses associated with VIEs \| $	$ 415.0	$ 412.4
Number of entities with debt guarantee \| Entity	1
Affiliate debt guarantee \| $	$ 4.7

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5747-111685

Name:	us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant