Fair Value Measurements - Schedule of Significant Unobservable Inputs Used in the Measurement of the Fair Value of Level 3 Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Measurements
Derivative assets	$ 11,678	$ 14,535
Derivative liabilities	1,333	$ 4,877
Level 3 | Discounted Cash Flow | Derivative Assets
Fair Value Measurements
Derivative assets	11,678
Level 3 | Derivative Liabilities | Discounted Cash Flow
Fair Value Measurements
Derivative liabilities	$ 1,333