Significant Accounting Policies - Recent Accounting Pronouncements (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Recent Accounting Pronouncements
Other Assets	$ 44,861	$ 30,224
Long-term Debt	$ 377,593	356,345
Accounting Standards Update 2015-03 | Adjustments for New Accounting Principle, Early Adoption [Member]
Recent Accounting Pronouncements
Other Assets		(2,900)
Long-term Debt		$ (2,900)