Schedule of Long-Lived Assets by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 329,038		$ 275,236
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	206,334		211,455
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 122,704	[1]	$ 63,781	[1]

[1] As of December 31, 2014 and 2013, long-lived assets attributable to Singapore were $99.2 million and $42.5 million, respectively.