Acquisitions and Dispositions (Surrender of Certain Corporate-Owned Life Insurance Policies) - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
Mar. 31, 2015	Aug. 28, 2015
Investments, All Other Investments [Abstract]
Proceeds from surrender of corporate-owned life insurance policies	$ 24,100	$ 24,068

The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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