Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax, Beginning balance	$ (1,911)		$ (1,447)
Other comprehensive income loss before reclassifications net of tax	1,361		(1,502)
Reclassification from accumulated other comprehensive income current period net of tax	5		2,404
Other comprehensive income (loss), net of tax	1,366	(917)	902	(1,165)
Accumulated other comprehensive income (loss), net of tax, Ending balance	(545)		(545)
Foreign currency translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax, Beginning balance	(1,130)		327
Other comprehensive income loss before reclassifications net of tax	177		(1,280)
Reclassification from accumulated other comprehensive income current period net of tax
Other comprehensive income (loss), net of tax	177		(1,280)
Accumulated other comprehensive income (loss), net of tax, Ending balance	(953)		(953)
Unrealized gains (losses) on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax, Beginning balance	(781)		649
Other comprehensive income loss before reclassifications net of tax	1,184		(207)
Reclassification from accumulated other comprehensive income current period net of tax	5		(34)
Other comprehensive income (loss), net of tax	1,189		(241)
Accumulated other comprehensive income (loss), net of tax, Ending balance	408		408
Unrealized gains (losses) on derivative instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax, Beginning balance			(2,423)
Other comprehensive income loss before reclassifications net of tax			(15)
Reclassification from accumulated other comprehensive income current period net of tax			2,438
Other comprehensive income (loss), net of tax			2,423
Accumulated other comprehensive income (loss), net of tax, Ending balance