Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Investments - Summary of Cash, Cash Equivalents and Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Amortized Cost	$ 113,450	$ 85,586	$ 35,843	$ 69,649
Fair Value	113,450	85,586
Amortized Cost	179,367	158,307
Gross Unrealized Gains	5	2
Gross Unrealized Losses	(62)	(109)
Fair Value	179,310us-gaap_AvailableForSaleSecurities	158,200us-gaap_AvailableForSaleSecurities
Cash and money market accounts
Investment Holdings [Line Items]
Amortized Cost	113,450	84,613
Fair Value	113,450	84,613
Certificates of deposit
Investment Holdings [Line Items]
Amortized Cost		472
Fair Value		472
Corporate bonds
Investment Holdings [Line Items]
Amortized Cost		501
Fair Value		501
Certificates of deposit (due within 1 year)
Investment Holdings [Line Items]
Amortized Cost	23,859	25,823
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(6)	(9)
Fair Value	23,855	25,814
Certificates of Deposit, Due Within Two Years [Member]
Investment Holdings [Line Items]
Amortized Cost	5,389	4,429
Gross Unrealized Gains	2	1
Gross Unrealized Losses	0	(3)
Fair Value	5,391	4,427
Corporate bonds (due within 1 year)
Investment Holdings [Line Items]
Amortized Cost	20,422	16,487
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(37)	(24)
Fair Value	20,385	16,463
Corporate Bonds, Due within 2 years [Member]
Investment Holdings [Line Items]
Amortized Cost	4,198	13,912
Gross Unrealized Gains	0
Gross Unrealized Losses	(15)	(64)
Fair Value	4,183	13,848
US Government Corporations and Agencies Securities [Member]
Investment Holdings [Line Items]
Amortized Cost	6,056	6,082
Gross Unrealized Gains	0
Gross Unrealized Losses	(3)	(6)
Fair Value	6,053	6,076
Total investments
Investment Holdings [Line Items]
Amortized Cost	65,917	72,721
Gross Unrealized Gains	5	2
Gross Unrealized Losses	(62)	(109)
Fair Value	65,860	72,614
Commercial paper
Investment Holdings [Line Items]
Amortized Cost	5,993	5,988
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(1)	(3)
Fair Value	$ 5,993	$ 5,986