Percentage of weighted average return on capital.

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Performance period.

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- Definition

Performance stock unit award beginning period date.

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Performance stock unit award ending period date.

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Performance stock unit award period.

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Period in beginning of each year to award performance share unit.

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- Definition

Share based compensation arrangement by share based payment award cumulative stockholder return rate.

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- Definition

Shares to be issued as a percentage of target shares under the performance incentive plan.

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Shares to be issued under performance incentive plan.

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- Definition

Stock appreciation rights income expense.

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Target level for the determination of performance goals and measures.

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- Definition

Target level for the determination of performance goals and measures for EBITDA goal.

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Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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- Definition

Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (k)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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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Date the equity-based award expires, in CCYY-MM-DD format.

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-Name Accounting Standards Codification
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- Definition

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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No definition available.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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Stockholders' Equity - Additional Information 1 (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 29, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period in the beginning of each year to award Performance Share Unit				90 days
PSU awards performance period	3 years
PSU awards performance period beginning date	Jan. 01, 2016
PSU awards performance period ending date	Dec. 31, 2018
Liability for SARs		$ 2,000,000		$ 2,000,000
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock appreciation rights income (expense)		$ 1,000,000	$ (2,000,000)	(1,000,000)	$ (5,000,000)
Payment due to exercise SARs				$ 2,000,000	$ 18,000,000
Time - Vesting Inducement Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Inducement award granted				75,000
Grant date fair value				$ 39.95
Inducement award service expiration date				Dec. 31, 2017
Performance - Vesting Inducement Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Inducement award granted				75,000
Grant date fair value				$ 12.55
Target level for the determination of performance goals and measures		100.00%		100.00%
Performance Period				2 years
Performance - Vesting Inducement Award [Member] \| Scenario, Forecast [Member] \| Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cumulative total stockholder return						25.00%
Performance - Vesting Inducement Award [Member] \| Minimum [Member] \| Scenario, Forecast [Member] \| Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Price						$ 43.70
Performance - Vesting Inducement Award [Member] \| Minimum [Member] \| Scenario, Forecast [Member] \| Tranche Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Price						$ 55
Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance Period				3 years
2016 Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Target level for the determination of performance goals and measures for adjusted EBITDA goal	50.00%
Weighted average return on total shareholders	50.00%
2016 Three-year PSU Awards [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares to be issued as percentage of target shares under performance incentive plan	0.00%
2016 Three-year PSU Awards [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares to be issued as percentage of target shares under performance incentive plan	200.00%
2013 Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares to be issued as percentage of target shares under performance incentive plan	200.00%
Shares to be issued under performance incentive plan	1,074,017