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Share Based Compensation - Components of Share-Based Compensation Expense (Income) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	$ (15)	$ 3,219	$ 3,327	$ 3,532
Compensation Expense	38	0	154	0
Share based and Long Term Incentive Compensation	23	3,219	3,481	3,532
Cash Settled Awards [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	(1,447)	1,488	(1,151)	(1,195)
Equity-settled awards [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	918	1,241	2,915	3,590
Restricted Stock [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	(20)	33	(3)	79
Employee Stock Option [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	534	457	1,566	1,058
General and Administrative Expense [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation			1,846	1,267
Share based and Long Term Incentive Compensation	(276)	1,290
Other Operating Expenses [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation			$ 1,635	$ 2,265
Share based and Long Term Incentive Compensation	$ 299	$ 1,929

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Share Based and Long Term Incentive Compensation

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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