Debt - Schedule of Net Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income Expense Net [Abstract]
Interest expense									$ 15,488	$ 12,542	$ 11,104
Interest income									(217)	(262)	(57)
Interest expense net of interest income									15,271	12,280	11,047
Capitalized interest									(738)	(839)	(689)
Interest expense, net	$ 3,773	$ 3,837	$ 2,869	$ 4,054	$ 2,617	$ 2,846	$ 3,021	$ 2,957	$ 14,533	$ 11,441	$ 10,358