Accumulated Other Comprehensive Loss - Summary of Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Current period unrealized gain (loss) on cash flow hedges, Pre-Tax Amount	$ 1,217	$ (450)
Reclassification adjustments on cash flow hedges, Pre-Tax Amount	194	320
Unrealized gains (losses) on cash flow hedges, net, Pre-Tax Amount	1,411	(130)
Current period unrealized gain (loss) on investments, Pre-Tax Amount	260	44
Unrealized gains (losses) on investments, net, Pre-Tax Amount	260	44
Other comprehensive income (loss), Pre-Tax Amount	1,671	(86)
Current period unrealized gain (loss) on cash flow hedges, Tax Expense (Benefit)	(495)
Unrealized gains (losses) on cash flow hedges, net, Tax Expense (Benefit)	(495)
Current period unrealized gain (loss) on investments, Tax Expense (Benefit)	(91)
Unrealized gains (losses) on investments, net, Tax Expense (Benefit)	(91)
Other comprehensive income (loss), Tax Expense (Benefit)	(586)
Current period unrealized gain (loss) on cash flow hedges, After-Tax Amount	722	(450)
Reclassification adjustments on cash flow hedges, After-Tax Amount	194	320
Unrealized gains (losses) on cash flow hedges, net, After-Tax Amount	916	(130)
Current period unrealized gain (loss) on investments, After-Tax Amount	169	44
Unrealized gains (losses) on investments, After-Tax Amount	169	44
Other comprehensive income (loss)	$ 1,085	$ (86)