Schedule of Long-Lived Assets by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 275,236	$ 265,782
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	211,455	211,422
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 63,781	$ 54,360