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Equity Compensation Plans - Unrecognized Compensation Cost (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2016	Jun. 30, 2016
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	$ 23,608	$ 23,608
Equity grants		6,318
Equity grant forfeitures		(4,727)
Equity compensation (expense) income		(8,569)
Unrecognized Compensation Cost at End of Period		16,630
Deferred Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Equity compensation (expense) income	(3,000)
Performance Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Equity compensation (expense) income	(600)
Incentive Plans | Restricted Stock
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	2,393	2,393
Equity grants		1,753
Equity grant forfeitures		(1,351)
Equity compensation (expense) income		(217)
Unrecognized Compensation Cost at End of Period		2,578
Incentive Plans | Deferred Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	14,392	14,392
Equity grants		4,441
Equity grant forfeitures		(1,167)
Equity compensation (expense) income		(6,677)
Unrecognized Compensation Cost at End of Period		10,989
Incentive Plans | Performance Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	6,823	6,823
Equity grants		0
Equity grant forfeitures		(2,209)
Equity compensation (expense) income		(1,613)
Unrecognized Compensation Cost at End of Period		3,001
Employee Stock Purchase Plan
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	$ 0	0
Equity grants		124
Equity grant forfeitures		0
Equity compensation (expense) income		(62)
Unrecognized Compensation Cost at End of Period		$ 62

X

- Definition

Allocated Share-based Compensation Expense, Including Restructuring

+ References

No definition available.

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- Definition

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]

+ References

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X

- Definition

Represents the amount of equity grant forfeitures during the period.

+ References

No definition available.

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X

- Definition

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

+ 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 (h)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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