Share Based Compensation - Summarized Activity of Stock Option Awards (Detail) - Stock Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of year, Options Outstanding	1,861
Granted, Options Outstanding	413
Exercised, Options Outstanding	0
Forfeited, Options Outstanding	(103)
Balance at end of period, Options Outstanding	2,171	1,861
Exercisable at end of period, Options Outstanding	1,687
Balance at beginning of year, Weighted Average Exercise Price	$ 20.74
Granted, Weighted Average Exercise Price	13.86
Exercised, Weighted Average Exercise Price	0.00
Forfeited, Weighted Average Exercise Price	18.01
Balance at end of period, Weighted Average Exercise Price	19.56	$ 20.74
Exercisable at end of period, Weighted Average Exercise Price	$ 20.83
Weighted Average Remaining Contractual Term	5 years	6 years
Exercisable at end of period, Weighted Average Remaining Contractual Term	4 years
Aggregate intrinsic value	$ 156	$ 643
Exercisable at end of period, Aggregate Intrinsic Value	$ 156