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Reinsurance - Reinsurance Arrangements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reinsurance Disclosures [Abstract]        
Direct premiums written $ 296,191 $ 271,921 $ 541,606 $ 499,894
Ceded premiums written (311,338) (72,874) (311,524) (146,933)
Net premiums written (15,147) 199,047 230,082 352,961
Direct premiums earned 244,623 226,819 480,998 448,071
Ceded premiums earned (75,614) (70,358) (150,430) (139,162)
Premiums earned, net 169,009 156,461 330,568 308,909
Direct Losses and Loss Adjustment Expenses 85,656 58,434 156,439 124,581
Ceded Losses and Loss Adjustment Expenses (5,472) 1,649 (5,685) 1,619
Net Losses and Loss Adjustment Expenses $ 80,184 $ 60,083 $ 150,754 $ 126,200