Equity-Based Compensation - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	0	0	0	0
Stock options exercised (in shares)	4,167	2,083	4,167	26,935
Intrinsic value of stock options exercised	$ 100,000	$ 100,000	$ 100,000	$ 900,000
Proceeds from options exercised	62,000	30,000	62,000	547,000
Actual tax benefit realized for the tax deductions from option exercises	14,000	20,000	14,000	300,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized equity-based compensation	400,000	600,000	900,000	1,300,000
Unrecognized compensation expense related to stock options	300,000		$ 300,000
Recognized weighted-average period			4 months
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized equity-based compensation	$ 2,000,000	$ 1,800,000	$ 3,800,000	$ 3,300,000
Recognized weighted-average period			1 year 11 months
Awards share units granted (in shares)	234,079	139,451	237,931	140,951
Unrecognized compensation expense related to awards	$ 11,000,000		$ 11,000,000
Grant date fair value of awards granted (in dollars per share)			$ 26.34
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized equity-based compensation	$ 4,500,000	$ 4,000,000	$ 8,600,000	$ 7,400,000
Recognized weighted-average period			1 year 5 months
Awards share units granted (in shares)	201,417	201,417	90,501	90,501
Unrecognized compensation expense related to awards	$ 15,500,000		$ 15,500,000
Grant date fair value of awards granted (in dollars per share)	$ 31.24	$ 30.37	$ 67.69	$ 67.69
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock that may be issued (in shares)	3,650,262		3,650,262

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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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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Number of share options (or share units) exercised during the current period.

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