Shareholders' Equity - Unrecognized Compensation Related to Awards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation	$ 12,525
Weighted average vesting period	1 year
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation	$ 244
Unvested awards | shares	22,191
Weighted average vesting period	6 months 11 days
RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation	$ 2,244
Unvested awards | shares	1,060,492
Weighted average vesting period	3 months 15 days
Performance Condition RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation	$ 431
Unvested awards | shares	375,000
Weighted average vesting period	3 months