Accumulated Other Comprehensive Income - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Equity [Abstract]
Current period unrealized gain (loss) on cash flow hedges, Pre-Tax Amount		$ 427
Reclassification adjustments on cash flow hedges, Pre-Tax Amount		(223)
Unrealized gains (losses) on cash flow hedges, net, Pre-Tax Amount		204
Current period unrealized gain (loss) on investments, Pre-Tax Amount	5	16
Reclassification adjustments on investments, Pre-Tax Amount		(83)
Unrealized gains (losses) on investments, net, Pre-Tax Amount		(67)
Other Comprehensive income (loss)	5	137
Current period unrealized gain (loss) on cash flow hedges, Tax Expense (Benefit)		(148)
Reclassification adjustments on cash flow hedges, Tax Expense (Benefit)		81
Unrealized gains (losses) on cash flow hedges, net, Tax Expense (Benefit)		(67)
Current period unrealized gain (loss) on investments, Tax Expense (Benefit)	(2)
Reclassification adjustments on investments, Tax Expense (Benefit)
Unrealized gains (losses) on investments, net, Tax Expense (Benefit)
Other Comprehensive income (loss)	(2)	(67)
Current period unrealized gain (loss) on cash flow hedges, After-Tax Amount		279
Reclassification adjustments on cash flow hedges, After-Tax Amount		223
Change in unrealized gain (loss) on derivatives		137
Current period unrealized gain (loss) on investments, After-Tax Amount	3	16
Reclassification adjustments on investments, After-Tax Amount		(83)
Change in unrealized gain (loss) on investments	3	(67)
Other comprehensive income (loss)	$ 3	$ 70