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Basis of Presentation - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) Store States
Basis Of Presentation [Line Items]
Entity formed, year	1998
Number of Locations | Store	400
Number of states | States	40
Usual completion period for contracts with service elements	30 days
Compensation-Stock Compensation Codification
Basis Of Presentation [Line Items]
Recognized previously unrecorded windfall benefits | $	$ 8.9

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- Definition

Basis of presentation.

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- Definition

Represents the number of locations.

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- Definition

The usual time period to complete all obligations under a contract with service elements.

+ References

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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- Definition

The number of states the entity operates in as of the balance sheet date.

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- Definition

Year the entity was founded, in CCYY format.

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