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Share Based Compensation - Components of Share-Based Compensation Expense (Income) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	$ 2,204	$ 991	$ 5,531	$ 4,523
Compensation Expense	41	0	195	0
Share based and Long Term Incentive Compensation	2,245	991	5,726	4,523
Cash Settled Awards [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	146	(801)	(1,005)	(1,996)
Equity-settled awards [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	1,654	1,307	4,569	4,897
Restricted Stock [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	16	22	13	101
Employee Stock Option [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation	388	463	1,954	1,521
General and Administrative Expense [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation			2,970	1,217
Share based and Long Term Incentive Compensation	1,124	(50)
Other Operating Expenses [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total share-based compensation			$ 2,756	$ 3,306
Share based and Long Term Incentive Compensation	$ 1,121	$ 1,041

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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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