Accrual for Exit and Realignment Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Restructuring Reserve [Roll Forward]
Accrued exit and realignment costs, beginning of period	$ 5,046	$ 5,602	$ 6,462	$ 4,274	$ 3,510	$ 2,909
Provision for exit and realignment activities	1,033	964	398	3,127	2,242	1,339
Cash payments, net of sublease income	(731)	(1,520)	(1,258)	(1,327)	(1,478)	(738)
Accrued exit and realignment costs, end of period	5,348	5,046	5,602	6,074	4,274	3,510
Lease Obligations
Restructuring Reserve [Roll Forward]
Accrued exit and realignment costs, beginning of period	3,669	3,446	3,575	2,178	2,555	2,434
Provision for exit and realignment activities	0	572	256	912	6	532
Cash payments, net of sublease income	(446)	(349)	(385)	(867)	(383)	(411)
Accrued exit and realignment costs, end of period	3,223	3,669	3,446	2,223	2,178	2,555
Severance
Restructuring Reserve [Roll Forward]
Accrued exit and realignment costs, beginning of period	1,377	2,156	2,887	2,096	955	475
Provision for exit and realignment activities	1,033	392	142	2,215	2,236	807
Cash payments, net of sublease income	(285)	(1,171)	(873)	(460)	(1,095)	(327)
Accrued exit and realignment costs, end of period	$ 2,125	$ 1,377	$ 2,156	$ 3,851	$ 2,096	$ 955