Total Expected Future Amortization Related to Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
2013	$ 5,527
2014	1,877
2015	1,114
2016	764
2017	714
2018 and thereafter	893
Total expected future amortization related to intangible assets	10,889
Intangible assets amortized to cost of revenues
Finite-Lived Intangible Assets [Line Items]
2013	4,212
2014	1,495
2015	1,019
2016	764
2017	714
2018 and thereafter	893
Total expected future amortization related to intangible assets	9,097
Other intangible assets amortized to operating expenses
Finite-Lived Intangible Assets [Line Items]
2013	1,315
2014	382
2015	95
Total expected future amortization related to intangible assets	$ 1,792