Business Combinations and Term Loan from Principal Stockholder - Additional Information (Detail) $ in Thousands		6 Months Ended
Jul. 01, 2015 USD ($) Stores	Jun. 30, 2015 USD ($)
Business Acquisition [Line Items]
Deposit under asset purchase agreement		$ 33,735
Titan Acquisition \| Asset Purchase Agreement \| Subsequent Event
Business Acquisition [Line Items]
Business acquisition, effective date of completion	Jul. 01, 2015
Payments to acquire businesses, gross	$ 34,500
Number of retail stores \| Stores	83
Diamond Family Investments, LP \| Senior Term Loan Facility \| Loan Agreement
Business Acquisition [Line Items]
Term loan borrowed		$ 30,000
Debt instrument, maturity date		Jun. 29, 2025
Term loan outstanding, interest rate		8.00%
Net of unamortized loan issuance costs		$ 300

Number of retail stores.

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

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

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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