Reconciliation of Benefit Obligations and Plan Assets of U.K. Plan and Japan Plan (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Oct. 31, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in plan assets:
Employer contributions		$ 1,800	$ 1,500	$ 1,800
UNITED KINGDOM
Change in benefit obligation:
Projected benefit obligation at beginning of year		34,713	27,335
Interest cost		1,403	1,359	1,486
Actuarial (gains) losses		(889)	5,008
Benefits paid		(688)	(582)
Foreign currency exchange rate changes		654	1,593
Projected benefit obligation at end of year		35,193	34,713	27,335
Accumulated benefit obligation at end of year		35,193	34,713
Change in plan assets:
Fair value of plan assets at beginning of year		28,629	24,590
Actual return on plan assets		3,903	2,461
Employer contributions	1,000	847	793
Benefits paid		(688)	(582)
Foreign currency exchange rate changes		766	1,367
Fair value of plan assets at end of year		33,457	28,629	24,590
Funded status at end of year		(1,736)	(6,084)
Amounts included in accumulated other comprehensive loss not yet recognized in net periodic pension cost
Net actuarial (loss) gain		(7,142)	(11,197)
Amounts expected to be amortized from accumulated other comprehensive loss into net periodic cost over the next fiscal year consists of:
Net actuarial gain		386	702
JAPAN
Change in benefit obligation:
Projected benefit obligation at beginning of year		1,865	1,401
Service cost		147	121	106
Interest cost		22	15	18
Amendments and transfers			417
Actuarial (gains) losses		(65)	89
Benefits paid		(1,119)	(140)
Foreign currency exchange rate changes		527	(38)
Projected benefit obligation at end of year		1,377	1,865	1,401
Accumulated benefit obligation at end of year		1,006	1,539
Change in plan assets:
Fair value of plan assets at beginning of year		827	582
Actual return on plan assets		5	9
Employer contributions		628	324
Benefits paid		(1,119)	(140)
Foreign currency exchange rate changes		213	52
Fair value of plan assets at end of year		554	827	582
Funded status at end of year		(823)	(1,038)
Amounts included in accumulated other comprehensive loss not yet recognized in net periodic pension cost
Net actuarial (loss) gain		2	(110)
Prior service cost		(211)	(281)
Net transition obligation		(163)	(237)
Amounts expected to be amortized from accumulated other comprehensive loss into net periodic cost over the next fiscal year consists of:
Prior service cost		20	16
Net transition obligation		$ 33	$ 26