Accrued Restructuring Obligations and Related Activity (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Accrued obligations, beginning balance $ 1,117 $ 1,676 $ 1,676
Restructuring expense 483 585 3,542
Settlement of obligations (218)   (4,101)
Accrued obligations, ending balance 1,382   1,117
Severance and Benefits      
Restructuring Cost and Reserve [Line Items]      
Accrued obligations, beginning balance 441 613 613
Restructuring expense 464 340 1,826
Settlement of obligations (157)   (1,998)
Accrued obligations, ending balance 748   441
Lease Abandonment Costs      
Restructuring Cost and Reserve [Line Items]      
Accrued obligations, beginning balance 676 1,063 1,063
Restructuring expense 19 139 318
Settlement of obligations (61)   (705)
Accrued obligations, ending balance 634   676
Other Costs      
Restructuring Cost and Reserve [Line Items]      
Accrued obligations, beginning balance        
Restructuring expense   106 [1] 1,398
Settlement of obligations     (1,398)
Accrued obligations, ending balance       
[1] Other costs for 2014 include the sale of the Company's Belfast, Northern Ireland location.