Accumulated Other Comprehensive Income (Loss) - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]
Current period unrealized gain (loss) on cash flow hedges, Pre-Tax Amount	$ (567)	$ 233	$ (452)	$ 719
Reclassification adjustments on cash flow hedges, Pre-Tax Amount	21	(561)	33	(1,144)
Unrealized gains (losses) on cash flow hedges, net, Pre-Tax Amount	(546)	(328)	(419)	(425)
Current period unrealized gain (loss) on investments, Pre-Tax Amount	(51)	69	(27)	23
Reclassification adjustments on investments, Pre-Tax Amount	11	(44)	11	(206)
Unrealized gains (losses) on investments, net, Pre-Tax Amount	(40)	25	(16)	(183)
Other comprehensive income/(loss), Pre-Tax Amount	(586)	(303)	(435)	(608)
Current period unrealized gain (loss) on cash flow hedges, Tax Expense (Benefit)	46	0	(1)	0
Reclassification adjustments on cash flow hedges, Tax Expense (Benefit)	0	0	1	0
Unrealized gains (losses) on cash flow hedges, net, Tax Expense (Benefit)	46	0	0	0
Current period unrealized gain (loss) on investments, Tax Expense (Benefit)	10	0	0	0
Reclassification adjustments on investments, Tax Expense (Benefit)	0	0	0	0
Unrealized gains (losses) on investments, net, Tax Expense (Benefit)	10	0	0	0
Other Comprehensive income (loss), Tax Expense (Benefit)	56	0	0	0
Current period unrealized gain (loss) on cash flow hedges, After-Tax Amount	(521)	233	(453)	719
Reclassification adjustments on cash flow hedges, After-Tax Amount	21	(561)	34	(1,144)
Unrealized gains (losses) on cash flow hedges, net, After-Tax Amount	(500)	(328)	(419)	(425)
Current period unrealized gain (loss) on investments, After-Tax Amount	(41)	69	(27)	23
Reclassification adjustments on investments, After-Tax Amount	11	(44)	11	(206)
Unrealized gains (losses) on investments, net, After-Tax Amount	(30)	25	(16)	(183)
Other comprehensive income (loss)	$ (530)	$ (303)	$ (435)	$ (608)