Reorganization - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Percentage of workforce reduction		4.00%					1.00%
Severance costs			$ 1,000	$ 800	$ 3,200		$ 1,800
Severance costs, adjustment	$ (200)
Reorganization costs	81		$ 1,039		$ 3,505	$ 1,888
Minimum [Member] | Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Expected increase in the workforce					5.00%
Maximum [Member] | Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Expected increase in the workforce					7.00%
Subsidiary Liquidation [Member]
Restructuring Cost and Reserve [Line Items]
Reorganization costs	$ 300				$ 332