XML 56 R43.htm IDEA: XBRL DOCUMENT v3.7.0.1
Income Taxes - Narrative (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]        
Effective tax rate 4.80% (0.40%) 3.20% 2.20%