Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total fair value of shares issued during the period under a deferred compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Equity Incentive Awards - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended		9 Months Ended
	Jul. 31, 2018	May 01, 2018	Feb. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	May 13, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of award (in years)						10 years
Number of shares available for grant (in shares)				2,927,923		2,927,923
Grants during the period (in shares)		6,270
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)								3,750,000
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				$ 2.7	$ 2.6	$ 7.3	$ 6.8
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, grants in period (in shares)	617	51,388	70,250
Fair value of shares issued	$ 0.1	$ 4.6	$ 5.9
Exercise price (in usd per share)		$ 89.65
Management \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)			3 years
Management \| Transition Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, grants in period (in shares)			70,250
Fair value of shares issued			$ 5.9
Award vesting period (years)			3 years
Vesting on December 28, 2018 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights (in percentage)						33.00%
Vesting on December 28, 2018 \| Transition Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights (in percentage)						67.00%
Vesting on December 28, 2019 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights (in percentage)						33.00%
Vesting on December 28, 2019 \| Transition Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights (in percentage)						33.00%
Vesting on December 28, 2020 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights (in percentage)						33.00%