Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - USD ($)	Feb. 27, 2017	Jan. 27, 2017
Senior Unsecured Notes Due in 2023 [Member] \| PGIM, Inc and Certain of Its Affiliates [Member]
Subsequent Event [Line Items]
Debt instrument, principal amount	$ 125,000,000
Debt instrument, interest rate	3.28%
Debt instrument, frequency of periodic payment	semi-annually
Debt instrument, maturity date	Feb. 27, 2023
Maximum borrowing capacity	$ 175,000,000
CCR [Member] \| Distribution Assets and Working Capital [Member] \| Distribution facilities located in Anderson, Fort Wayne, Lafayette, South Bend and Terre Haute, Indiana [Member]
Subsequent Event [Line Items]
Cash purchase price		$ 31,600,000
Effective date of business acquisition		Jan. 27, 2017

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e845-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Acquisition Date
-URI http://asc.fasb.org/extlink&oid=6919109

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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