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Share-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restructuring charges related to the termination of former Chief Executive Officer	$ 5,250,000	$ 0	$ 6,416,000	$ 0	$ 3,300,000
Chief Executive Officer [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restructuring charges related to the termination of former Chief Executive Officer			3,700,000
Accelerated Share Based Compensation [Member] \| Chief Executive Officer [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restructuring charges related to the termination of former Chief Executive Officer	$ 1,300,000		$ 1,300,000

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details