Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Customer	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary Of Significant Accounting Policy [Line Items]
Major customer revenue	1 billion-plus
Original maturities	90 days
Number of customers accounted for revenues or accounts receivable greater than 2% of total	0
Percentage of revenue represent by single customer maximum threshold	2.00%
Annual goodwill impairment test, period	November 30
Non-current deferred rent liabilities	$ 6,678,000	$ 6,936,000
Foreign exchange losses	400,000	400,000	1,300,000
Remeasurement gains on deferred tax liability		100,000	100,000
Special dividend declared per common share				$ 3.00
Unamortized fair value stock based compensation	12,500,000
Weighted average remaining recognition period	2 years 2 months 12 days
Indefinite-lived intangible assets	$ 0
Stock Options [Member]
Summary Of Significant Accounting Policy [Line Items]
Anti-dilutive Options to Purchase Shares	0.7	0.8	0.3